You are here: / / / Horse Hill – Alto Bowl Preserve Hike | Marin County Hikes

The Horse Hill-Alto Bowl Preserve Hike: Incredible Views & “Working” Horses

Marin County Loop Hikes

|February 13, 2026|inMarin County Hikes, Marin Lifestyle
Horse Hill featuring group of horses, including brown and white ones, graze and rest on a green grassy hill under a clear blue sky with Mt. Tamalpais and trees adding to the scenic backdrop.

The Horse Hill Hike Between Mill Valley and Corte Madera is Truly Spectacular

Looking for a 45-minute hike that combines Marin history, incredible views, and a classic “Old California” ranch vibe right off the highway? Like many who drive Highway 101 through Mill Valley, I had driven past the iconic grassy knoll known as “Horse Hill” thousands of times. I always assumed the herd I saw grazing there was just part of a private ranch I couldn’t access. Little did I know, this is actually the Alto Bowl Open Space Preserve, and it offers one of the most beautiful “top of the world” loop hikes in Marin County!

As you will read in the Horse Hill history below, these fourteen horses may look like they are relaxing, but they are working, keeping the grass trimmed and helping reduce wildfire risk.

Horse Hill Hike Quick Facts

  • Time: About 45 mins -1 hour depending on route and how much time you spend talking to the horses (from a distance)
  • Gorgeous views: San Francisco Skyline, Richardson Bay, Mt. Tamalpais.
  • The Horses: Usually up to 14 horses graze here; do not feed or pet them. Typically they go up the hill in the morning and come back down in the mid-afternoon.
  • Trail Directions: Well-signed and easy to follow
  • Difficulty: Moderate grade suitable for beginner to intermediate hikers
  • Terrain: Single-track trails (can be muddy in winter) and fire roads.
  • Amenities: No drinking fountains or restrooms. Garbage cans and dog waste bags near parking.
  • Poison oak just off the trail farther north in the Alto Bowl preserve
  • Cell Service: AT&T excellent, Verizon excellent except near Scott Valley Swim & Tennis Club
  • Quiet: Be respectful of neighbors and always yield to horses, keeping dogs away from them (see trail rules below)
  • Safety: Do not leave valuables in car
View the Top 10 Best Hikes in Marin Here

Horse Hill Hike – Getting There

This hike is easily accessible from Mill Valley and is just 5 minutes from the freeway. From Hwy 101, take the Tiburon Blvd / E Blithedale Ave exit and head west on E Blithedale towards Mill Valley. Turn right on Tower Drive (near the Redwoods), right on Plaza Drive, and follow Plaza up to Lomita Drive. To get to the barn and parking lot, turn right on Lomita and follow it to where it ends at the parking lot and stable (right next to 101).

If the parking lot is full, turn around, and drive west on Lomita about 3 minutes until you see the Dollar Fire Road trailhead on the right. There is street parking all along Lomita. Take the fire road up to the top and rejoin the walkthrough at step #4.

Maps were disabled by the visitor on this site. Click to open the map in a new window.

Horse Hill Hike Map

Park in the parking lot (red circle) and follow the trail up and counterclockwise in a loop back to the parking lot. You will be on single track trails, fire roads, and even public streets for a short period of time. (See walkthrough below.)

Horse Hill Hike Map with hiking area circled in grey, and parking areas marked with red and blue circles.

A History of Preservation: From Dairy Farm to Open Space

Before it was a hiking destination, this land was a working landscape deeply rooted in Marin’s agricultural past. Originally part of the Rancho Corte Madera del Presidio land grant, the area became the Alto Dairy in the early 1900s, where cattle grazed these exact slopes.

However, the open space we enjoy today was nearly lost; throughout the 1960s and 80s, developers proposed massive projects for the site, including one plan for 1,200 apartments that would have covered the hillside. Local residents, led by preservationists like Aline McClain, fought for decades to stop the bulldozers. In a true community victory, the “Save the Horse Hill Committee” raised the necessary funds in the late 1980s to purchase the land for the public.

Today, the Alto Bowl Horse Owners Association keeps that ranching spirit alive, managing the herd you see from the highway—a living tribute to the land’s history and a functional team working to reduce fire risk.

Take a moment on your hike to think of all those who worked to preserve this beautiful area for future generations.

A light-colored horse grazes on a grassy hillside with trees and a hazy, forested landscape in the background on a sunny day.

Horse Hill Hike Rules

This beautiful hike is a gift to us from Marin citizens who worked years ago to preserve this land so we could enjoy it. Please respect the posted rules.

Horse Rules:

  • Do not feed the horses! You might think you’re being nice to the horses, but you may actually be causing harm or even death.
  • Stay at least 20 feet away from the horses, unless invited to approach by a horse handler.
  • Do not touch the horses.
  • Watch your children at all times and keep dogs on leash around horses.

Trail Rules – Horses Always Have the Right of Way

Dogs:

  • Leash Policy: Dogs must be leashed on signed trails (leash max 6 feet). They may be off-leash on fire roads only if under voice control, but you must still carry a leash.
  • Restrictions: Maximum of 3 dogs per person. No commercial dog walking.
  • Waste: Owners must clean up and remove pet waste.

Bikes:

  • Permitted only on signed fire roads and trails designated for multi-use.
  • Speed Limit: 15 mph max. Must slow to 5 mph when passing others or around blind turns.

Horses:

  • Permitted on signed fire roads and designated trails. Off-trail use is prohibited (except when watering or resting the horse).

General:

  • Stay on trails/roads; off-trail use is prohibited to protect the habitat.

Emergency Contacts:

In an Emergency: Call 911

Open Space Rangers: (415) 473-2816

Horse Hill Hike Overview

Step-by-Step Guide. Scroll down for the visual walkthrough or click bolded titles to jump directly to photo for that step.

  1. Start at the Lot: Park in the designated parking lot and enter through the trailhead gate to the north (the freeway will be on your right). Please be sure to close the gate behind you to keep the horses safe.
  2. The Feed Area: You will enter a dirt area with large tires on the ground used to hold feed for the horses. If you’ve timed your visit right, you won’t see any horses here because they are already grazing up on the hill!
  3. Begin the Ascent: Go off to the left (your back towards 101) and start hiking up the dirt trail. You will be doing a counter-clockwise loop starting with the peak, winding your way around through Alto Canyon and Scott Valley Swim and Tennis Club, then back to the junction in step four. Watch where you step – the horses also use this trail!
  4. The Main Junction: Hike up to the top and turn right on the fire road. This is the “Main Junction” you will circle back to in Step 16. You may start seeing horses at this point—remember to stay at least 20 feet away from them. You’ll see electric lines and towers on your right as you ascend. You are here now.
  5. Climbing Up: Climb up this steep grade and enjoy seeing the horses!
  6. Horse Hill Trail: The trail turns left at the “Horse Hill Trail” marker. Keep the power lines to your right.
  7. Into the Oaks: You will enter a shady area where the trail winds between mature oaks. You’ll see houses on the right (past the fence) and a “Welcome to Alto Bowl Open Space Preserve” sign. Meadowcrest Drive is visible on your right. Meadowcrest Drive is on your right.
  8. The Gate: Pass through the metal horse gate (please close it for their safety) and continue along the trail. You are here right now.
  9. Follow the Markers: Continue along the trail through the oaks, keeping the houses on your right. You will see another “Horse Hill Trail” marker telling you to proceed straight. You are here right now.
  10. Descent to Alto Bowl: The path widens as you descend to the Alto Bowl Fire Road trail marker, where you will turn left. You’ll see homes to your right and the Bob Midahi Trail straight ahead but don’t take that if you want to do this hike. You are here right now.
  11. Coach Road Neighborhood: Keep walking straight (this stretch becomes Coach Road.) You will emerge in a neighborhood at the intersection of Coach Road and Benson Circle, right near a beautiful Mill Valley home I sold recently.  You are here right now.
  12. Towards Scott Valley: Keep walking straight, crossing Underhill Road and heading into the Scott Valley Swim & Tennis Club. Walk straight towards the tennis courts. (Note: Some hikers choose to park here and start the Horse Hill Hike from this side).
  13. The Tennis Courts: Pass the tennis courts (you’ll see restrooms on the left) and go through the trailhead gate. You’ll see a clothing donation box on the left that has been there for a long time. Go left just after the gate and head up the hill (ignore the trail to the right). You are here right now.
  14. Single Track Climb: You will hike a few minutes on a steeper incline, single-track trail through the woods. Look for a “Gas Pipeline” warning sign on the right as you approach and pass through another metal gate (again, please close it behind you).
  15. Back on the Hill: You are now back out on Horse Hill in the sun! The trail will start curving left and upward as you complete your circle. You are here right now as you hike up.
  16. Closing the Loop: You will soon arrive back at the Main Junction from Step #4. You are back here now.
  17. The Descent: To return to your car or bike, simply head back down the trail you first hiked up in Step 3. Soon you’ll be back at the bottom, with happy memories of horses, history, and nature.

Please scroll down to see the visual Horse Hill Hike walkthrough below.

Horse Hill Hike Walkthrough

A large white sign reads, “DO NOT FEED THE HORSES!” and explains that feeding can harm horses due to dietary restrictions. The sign is posted outdoors, near a fence and grassy hillside with rocks in the background.
Horse Hill Hike Parking Lot in Mill Valley CA with bike path on the right and hwy 101 outside fence to the right

#1

Start at the Lot: Park in the designated parking lot and enter through the trailhead gate to the north (the freeway will be on your right). Please be sure to close the gate behind you to keep the horses safe.

A dirt trail winds up a grassy hill under a clear blue sky. On the left, part of a metal-roofed shelter is visible, and an old tire lies on the ground near the trail.

#2

  1. The Feed Area: You will enter a dirt area with large tires on the ground used to hold feed for the horses. If you’ve timed your visit right, you won’t see any horses here because they are already grazing up on the hill!
A woman dressed in black walks a small brown dog along a dirt trail on a grassy hillside under a clear blue sky. Trees and distant hills are visible in the background.

#3

Begin the Ascent: Go off to the left (your back towards 101) and start hiking up the dirt trail. You will be doing a counter-clockwise loop starting with the peak, winding your way around through Alto Canyon and Scott Valley Swim and Tennis Club, then back to the junction in step four. Watch where you step – the horses also use this trail!

A dirt trail winds up a grassy hill under a clear blue sky on the Horse Hill Hike. Power lines and towers line the background, while a few people walk along the path toward sparse trees on the hilltop.

#4

The Main Junction: Hike up to the top and turn right on the fire road. This is the “Main Junction” you will circle back to in Step 16. You may start seeing horses at this point—remember to stay at least 20 feet away from them. You’ll see electric lines and towers on your right as you ascend. You are here now.

Steep uphill fire trail on Horse Hill hike with power lines in distance
Two horses, one white and one brown, stand on Horse Hill above Mill Valley, CA under a clear blue sky. The brown horse is in the foreground, while the white horse is farther back, both illuminated by sunlight on the grassy hill.

#5

Climbing Up: Climb up this steep grade and enjoy seeing the horses!

Two horses, one white and one brown, stand on a grassy hill along the Horse Hill Hike. In the background are rolling hills, scattered trees, and distant houses in Mill Valley, CA under a clear blue sky.
A dirt path winds through grassy Horse Hill Hike, surrounded by trees under a clear blue sky. Power lines and a tall utility tower are visible in the background.

#6

Horse Hill Trail: The trail turns left at the “Horse Hill Trail” marker. Keep the power lines to your right.

A dirt path winds through grassy Horse Hill Hike, surrounded by trees under a clear blue sky. Power lines and a tall utility tower are visible in the background.

#7

Into the Oaks: You will enter a shady area where the trail winds between mature oaks. You’ll see houses on the right (past the fence) and a “Welcome to Alto Bowl Open Space Preserve” sign. Meadowcrest Drive is visible on your right. Meadowcrest Drive is on your right

A dirt path runs through a grassy field beside a road lined with trees and a fence under a clear blue sky. In the distance, more trees and shrubs are visible.

#8

The Gate: Pass through the metal horse gate (please close it for their safety) and continue along the trail. You are here right now.

A dirt hiking trail winds through green grass and leads towards dense trees under a clear blue sky. A trail marker stands on the right side of the path.

#9

Follow the Markers: Continue along the trail through the oaks, keeping the houses on your right. You will see another “Horse Hill Trail” marker telling you to proceed straight. You are here right now.

A dirt hiking trail forks in a grassy area with a trail marker post in the center. Leafy trees border the path, and sunlight brightens the scene, suggesting a peaceful outdoor setting.
Four deer stand under the shade of a large, leafy tree on a sunlit grassy slope. Dappled sunlight filters through the branches, highlighting the green grass and casting shadows around the animals.

#10

Descent to Alto Bowl: The path widens as you descend to the Alto Bowl Fire Road trail marker, where you will turn left. You’ll see homes to your right and the Bob Midahi Trail straight ahead but don’t take that if you want to do this hike. You are here right now.

A dirt path winds through green grass and trees, leading to a closed wooden gate and fence. The sky is clear and sunny, with hills and more trees in the background—a peaceful scene along the Horse Hill Hike.

#11

Coach Road Neighborhood: Keep walking straight (this stretch becomes Coach Road.) You will emerge in a neighborhood at the intersection of Coach Road and Benson Circle, right near a beautiful Mill Valley home I sold recently.  You are here right now.

A sign reading Scott Valley Swimming & Tennis Club stands by a road with a Please Slow Down caution sign nearby. Several cars are parked under trees and in a lot next to a gray building in the background.

#12

Towards Scott Valley: Keep walking straight, crossing Underhill Road and heading into the Scott Valley Swim & Tennis Club. Walk straight towards the tennis courts. (Note: Some hikers choose to park here and start the Horse Hill Hike from this side).

Empty parking lot next to tennis courts, surrounded by trees and greenery on a clear, sunny day. Power lines run above, and shadows are cast across the pavement.
A paved road curves past a green clothes and shoes donation bin on the left, leading toward a gate and a wooded area with trees and greenery in the background.

#13

The Tennis Courts: Pass the tennis courts (you’ll see restrooms on the left) and go through the trailhead gate. You’ll see a clothing donation box on the left that has been there for a long time. Go left just after the gate and head up the hill (ignore the trail to the right). You are here right now.

A dirt trail winds through a forest with tall trees, ferns, and lush green undergrowth. Exposed roots cross the path, and sunlight filters through the dense foliage.

#14

Single Track Climb: You will hike a few minutes on a steeper incline, single-track trail through the woods. Look for a “Gas Pipeline” warning sign on the right as you approach and pass through another metal gate (again, please close it behind you).

A dirt trail winds through a forest with tall trees, ferns, and lush green undergrowth. Exposed roots cross the path, and sunlight filters through the dense foliage.

#15

Back on the Hill: You are now back out on Horse Hill in the sun! The trail will start curving left and upward as you complete your circle. You are here right now as you hike up.

A dirt path winds through a green grassy hillside under a clear blue sky on the Horse Hill Hike. A single tree stands near the path, while power lines supported by a tall metal tower cross the background hills.

#16

Closing the Loop: You will soon arrive back at the Main Junction from Step #4. You are back here now

Horse Hill Hike trail looking towards parking lot with Hwy 101 in the distance

#17

The Descent: To return to your car or bike, simply head back down the trail you first hiked up in Step 3. Soon you’ll be back at the bottom, with happy memories of horses, history, and nature.

In Conclusion

I hope you have enjoyed reading my article about one of my favorite hikes at the end of Freitas Parkway. If this is your first visit to my Marin Real Estate and Lifestyle Blog, please have a look at my other articles. They all feature original articles about the things that make Marin County such a great place to live — restaurants, hikes, and even profiles of those who live here.

Also in my blog is my monthly Marin real estate market update. As a top real estate agent here in Marin County, I truly love what I do and would love to help you attain your own real estate goals. Please call or text me at 415.847.5584 and I’ll be in touch right away. Otherwise, I will see you on the trails!

Click Here to Read My Other Marin Hiking Blog Articles
Marin top real estate agent Thomas Henthorne headshot

About the Author

Thomas Henthorne is consistently top-ranked, award-winning real estate agent in Marin, helping people buy and sell homes for almost a decade. He writes the #1 real estate blog in Marin County and is a frequent speaker on panels at industry gatherings.

He may be reached at 415-847-5584.

Learn More About Thomas Henthorne

Please call / text Thomas at 415-847-5584 or fill out this contact form and he will be in touch right away.

Join the V.I.P. List

Sign Up for My Newsletter Here

Tell Me What You Think

Additions, comments and corrections welcome.

0 replies

Leave a Comment

What do you think?
Please leave your comment below!

Leave a Reply

Your email address will not be published. Required fields are marked *

Things to Do in the San Francisco Bay Area | February 2026Things to do SF Bay Area Feb 2026February 2026 Marin county real estate market report graphic showing median sold price, number of homes for sale, days on market and months of supply metricsMarin County Real Estate Market Report February 2026