Please review our hiker info page to familiarize yourself with hiker safety rules and our hike ratings so that you can select hikes that meet your level of fitness. Unless specified otherwise in the activity descriptions below, hikes have a 15 person limit, and they begin in the ABDNHA parking lot.

  • ABDNHA Friendly Friday Bike Ride

    ABDNHA Friendly Friday Bike Ride

    Leader: Paul Petersen, ABDNHA Volunteer. Relaxed social ride of 20-30 miles, mostly flat, at a 10-12 mph pace. Routes vary weekly, and fun rides to highlight the roads less traveled. Return times vary depending on the chosen route. FREE, every Friday. No registration required. Meet in the parking lot opposite the County Public Library.

  • ABDNHA Friendly Friday Bike Ride

    ABDNHA Friendly Friday Bike Ride

    Leader: Paul Petersen, ABDNHA Volunteer. Relaxed social ride of 20-30 miles, mostly flat, at a 10-12 mph pace. Routes vary weekly, and fun rides to highlight the roads less traveled. Return times vary depending on the chosen route. FREE, every Friday. No registration required. Meet in the parking lot opposite the County Public Library.

  • Romania Trip 2026

    Spots are still available

    Join Anza-Borrego Desert Natural History Association on a grand tour of Romania, one of Europe’s most underrated destinations. Romania has beautiful nature, charming medieval towns, stately castles, colorful monasteries, traditional rural areas, interesting history, and several UNESCO world heritage sites. The group will be led by geologist Don Barrie, GeoTours tour director Matt Ebiner, and an English-speaking Romanian guide.

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