Click here for info on hiker safety rules and our hike ratings.
Week of Events
Sunday, November 15, 2026
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November 15, 2026 -Nature Walk: The Mason Valley Cholla
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November 15, 2026 -ABDNHA’s Annual Attic & Book Sale
Nature Walk: The Mason Valley Cholla
Leader: Don Rideout, Botany Club Coordinator
View Mason Valley Pink Teddy-Bear Cholla and other unique plants on an easy-to-moderate walk through cactus-filled terrain. Wear hiking clothes, boots, and a hat; bring water and sunscreen. No charge; open to the public; registration required. Meet at the ABDNHA parking lot at 9 a.m. to caravan. Register at the Nature Center or 760-767-3098.
ABDNHA’s Annual Attic & Book Sale
Major fundraising sale for ABDNHA with treasures and books of all kinds! Don’t miss this annual event! In the ABDNHA Activity Room and parking lot between ABDNHA and Carlee’s restaurant. Opens at 9 a.m.
Click here for more info.
Monday, November 16, 2026
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November 16, 2026 -Hike: Stonewall Peak via Milk Ranch Road & Azalea Glen
Hike: Stonewall Peak via Milk Ranch Road & Azalea Glen
Leader: Rachel Rench, ABDNHA Volunteer
This 11-mile hike takes about five hours with a lunch break, plus an hour of travel each way. Start on Milk Ranch Rd., loop to Paso Picacho Campground via Azalea Glen Trail, cross the highway, and ascend Stonewall Peak for a 360-degree park view. After lunch, descend Stonewall, pass the old horse camp, head to the lake, and finish at the Trout Pond parking area. No charge; registration required. Call or visit the Nature Center at 760-767-3098 to reserve.
Note: Meet at the ABDNHA parking lot at 8 a.m. to carpool, or at 9 a.m. at Trout Pond/Middle Peak parking in Cuyamaca Rancho State Park (located on the east side of Hwy. 79, at the southern tip of Lake Cuyamaca). Consult a map if unfamiliar with the location.
Tuesday, November 17, 2026
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November 17, 2026 -Hike: Marble Canyon – FULL (Wait List)
Hike: Marble Canyon – FULL (Wait List)
Leader: Terri Straub, ABDNHA Volunteer
This hike is FULL - please call ABDNHA at 760-767-3098 to get on the wait list.
This moderate hike is 5.4 miles, with a 1200’ elevation gain. A close-to-town, little-known gem. All vehicles are suitable. Maximum 15 participants. Meet at the ABDNHA by parking lot 7:50 a.m. Bring snacks and water. No charge, but call or visit the Nature Center to reserve, 760-767-3098.
Wednesday, November 18, 2026
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November 18, 2026 -Hike: Alcoholic Pass – FULL (Wait List)
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November 18, 2026 -Meeting: Borrego Rock & Gem (BRAG) Club
Hike: Alcoholic Pass – FULL (Wait List)
Leaders: Greg Winterowd and Amy Brueggemeyer, ABDNHA Volunteers
This hike is FULL - please call ABDNHA at 760-767-3098 to get on the wait list.
This is a moderate two-to-four-mile hike. Steep but well-marked switchbacks lead to the pass in two miles, then descend to explore the other side. Wear sturdy shoes or boots, hat, and sun protection. Bring water and a snack. Hiking poles are optional. No charge. Register at the Nature Center or 760-767-3098. Meet at ABDNHA parking lot at 7:50 a.m. for a 20-minute drive (carpooling recommended). 4WD preferred. Maximum nine participants.
Thursday, November 19, 2026
No events on this day.
Friday, November 20, 2026
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November 20, 2026 -Biking: ABDNHA Friendly Friday Bike Ride (Every Friday)
Biking: ABDNHA Friendly Friday Bike Ride (Every Friday)
Leader: Paul Petersen, ABDNHA Volunteer
Relaxed social ride of 20-30 mostly flat miles at a 10-12 mph pace. Routes will vary weekly; fun rides to highlight the roads less traveled. Return time will vary by the route chosen. No charge or registration required. Meet in the parking lot opposite the public County Library’s south entrance.
Saturday, November 21, 2026
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November 21, 2026 -ABDNHA Member Appreciation Day
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November 21, 2026 -Walk: Historic Borrego Walkabout
ABDNHA Member Appreciation Day
20% Off in-store for ABDNHA Members and New Members who join today!
Members receive 20% off purchases 9 a.m. to 5 p.m. today in the Nature Center. Do all your holiday shopping in one place and support ABDNHA with your purchases. Join ABDNHA today and make the desert a part of your life!
Walk: Historic Borrego Walkabout
Leader: Selden McKee, ABDNHA Volunteer
Curious about the story of Borrego Springs, from its historic beginnings to today? Enjoy a walk around the town while hearing about the people, places, and buildings of this tiny desert town that we love. We will start at ABDNHA and cover roughly 1.5 miles, all on flat terrain. Wear comfortable walking shoes and a good sun hat, and bring water. No charge, but registration required. Meet at the ABDNHA parking lot. Register at the Nature Center or 760-767-3098.