VISITOR ALERT: Highway 18 closed east of Crestline turnoff

Highway 18 between the Crestline turnoff and Rimforest remains closed due to geological issues at Red Rock Wall. According to Caltrans, the closure could extend through summer and even into fall. So if you’re traveling into the mountains on Highway 18, you’ll need to turn left at the Lake Gregory Drive stoplight and then right immediately onto Highway 189. Follow the winding uphill  and then downhill drive through Twin Peaks. After several miles, you’ll come to another detour sign that will lead you back to Highway 18. If this sounds more than a little confusing or inconvenient, you may want to consider accessing the Arboretum from Highway 330 through Running Springs.

Hours & Directions

Because of the wildlife in and around the Arboretum, it's potentially unsafe to visit the site and especially to hike the Sequoia Trail after dark. During daylight hours, that's not an issue.

With schools back in session, the booth is now open on weekends only--from 11 a.m. to 3 p.m. We accept cash and cards, but please note that the minimum credit or debit purchase is $10.

We're in San Bernardino National Forest between Lake Arrowhead and Running Springs. The main routes leading to Heaps Peak Arboretum are Highways 18 and 330. (Caltrans highway info: 800.427.7623.)

29358 Rim of the World Hwy. 18
Skyforest, CA 92385
Directions & Parking

Adventure Passes

An Adventure Pass or other valid pass (such as America the Beautiful) is required to park in the Arboretum’s lot–whether or not the Information Booth is open. As always, entrance to the Arboretum itself is free.

RESOURCEFUL! Find excellent information about our native plants and animals at. . .


What's Up at HPA

First Saturdays Birding Walks: Each first Saturday of the month through Sept. 3, noted native-bird expert Ken Wells will be leading these early-morning walks at the Arboretum (DETAILS).

Second Saturdays @ the Arb: Weather permitting, we’ll have planting or other nature-based activities on the second Saturday of each month starting at 10 a.m. (DETAILS).

NEIGHBORLY NOTE: The Children’s Forest Visitor Information Center, just east of Running Springs, is now open weekends for fun, nature-focused activities. For more information, see mountainsfoundation.org/programs/childrens-forest.

More details. . .
Events Calendar

Fall Native Plant Sale: Saturday, Oct. 15

The Spring Native Plant Sale was held on Saturday, April 30. Nearly 200 “enthusiasts” visited us that morning to take advantage of an excellent native-plant selection and support the Arboretum. Our Fall Native Plant Sale is set for Saturday, Oct. 15, beginning at 9 a.m. The plant list below, from last year’s mid-October sale, is simply an example provided for your information. 

Explore the Forest

This family- and dog-friendly trail is nearly one mile long. Descending and then rising gently, it’s an easy hike with numbered signposts along the way. An information-rich trail guide, keyed to those numeric posts, makes your hike even more interesting and educational.

Photo: Anneke Fischle

The Arboretum’s gardens display a wide variety of flowers, shrubs and other plants. Largely native to the San Bernardino Mountains, many of them are identified by easy-to-read signs. The nearby Information Booth offers print and visual aids to help you learn even more!

Expertly guided tours are available on request. They’re intended especially for visiting groups such as schoolchildren, Boy and Girl Scouts, gardening clubs and birdwatchers. For details: info@hparboretum.com.

On the blog...


Through habitat restoration, trail maintenance and other efforts, we’re working to protect and conserve our area’s expanse of the National Forest.


Heaps Peak Arboretum has a diverse collection of mostly native trees, shrubs, wildflowers and other plants. Some of them might do well in your garden. Learn more at the Arboretum!

about us

Rim of the World Interpretive Association

Rim of the World Interpretive Association (ROWIA) is a California nonprofit, public-benefit corporation founded in 1982. In partnership with the U.S. Forest Service, we maintain and staff Heaps Peak Arboretum. 

We’re committed to protecting and conserving our natural resources for future generations to enjoy.