Flower Landscape Photo

Registration is required for events as noted. Drop-ins are welcome at all other events. Rain cancels. No pets please. For more information, call Teri at 408-224-7476.


Healthy Parks - Healthy People (ongoing)
First Saturday of the Month, 10:00 to 11:00 am
Alum Rock Park, Meet at the Ranger Station

We will get some very gentle exercise while we enjoy the serenity and beauty of this historic place. Please bring $6 for parking and sorry, no pets.


Hike into the Burn - A Plant Lover’s Experience
Saturday January 25, 2014 10:00 am to 3:00 pm

Rancho Cañada Open Space Preserve
Join OSA docents, David Chapman with the California Native Plant Society and fellow plant lovers on this slow, methodical and technical walk into an area that recently burned. Join local experts for this rare educational experience. Participants must be over the age of 18 and able to hike steep terrain with uneven footing. Please call (408) 224-7476 to book your spot now. Space is limited due to the sensitive nature of this area.

Starry Nights
Saturday January 25, 2014  7:00 pm to 9:00pm

Rancho Cañada Open Space Preserve
The New Year has begun and the evening sky is as startlingly beautiful as ever. Don't have a telescope? Don't worry. We have plenty of very friendly docent astronomers who would love to share the view through theirs with you. Dress warm, bring something warm to drink and join us for an evening out under the stars. It is so dark here you can see the Milky Way. Please park in the paved parking lot and try to arrive on time as headlights from cars can wash out the darkness needed to view the celestial scenery.  Families and children are welcome. To learn more, please visit the San Jose Astronomical Group at http://www.sjaa.net/.


Mystery at the Alviso Adobe, Milpitas
Saturday Feb 8, 2014 10:00 am to 12:00 noon

Alviso Adobe Court- Calaveras and Piedmont Road in Milpitas
Join us for a family-friendly educational exploration disguised as fun! You will help to solve a mystery as you examine evidence and discover clues, all while learning about the cultural and natural history of this site. You won't want to miss out on our Crime Scene Investigation Game (CSI). All are welcome and the location is paved for all capabilities. Come help us solve the clues!


Staff of the Open Space Authority and volunteers provide the general public with a variety of things to do. Hikes, rides and special events offer a chance to enjoy the Authority’s trails and preserves and learn about the natural world in the company of others.

activity photoWildflower hike

Our schedule includes such things as guided nature hikes, bike and equestrian rides, photography walks and stargazing sessions. OSA also creates special events for children, including a summer day camp and Halloween celebration. All activities are free and open to everyone.

The Open Space Authority also offers a number of education programs for school and community groups. These programs are booked through the Coordinator of Interpretive Programs, who can be reached at 408-224-7476 or by email.