Date & Time: Seasonal (February-September), times vary

Become a citizen scientist and join the Weed Watchers team! The Weed Watcher program is a volunteer-based invasive plant early detection program. Weed Watchers survey trails and roads in spectacular locations throughout the Golden Gate National Parks to identify weeds as they first invade. Discovering weeds before they become well-established is critical to reducing damage to ecosystem integrity, preventing the loss of habitat for rare plants and animals, and preventing costly natural resource management. Location varies throughout San Mateo, San Francisco, and Marin counties.

Join staff and other volunteers on excursions to search for the priority weeds of the park. Learn to use your digital camera, smart phone, or GPS unit to report weed sightings to park managers via the Internet. The hikes vary in length and difficulty and last approximately 3–4 hours. Weed Watcher walks are focused on identification and mapping, with strategic removal of small, new weed patches. These outings are perfect for anyone who wants to learn more about the plants of the park. 

Age, Skills, What to Bring:

  • Adults and youth are welcome. With young volunteers, adult chaperones are encouraged.
  • No experience necessary. Training will be provided. Fulfills community service requirements.
  • Bring the appropriate waiver forms (see below).
  • Please wear comfortable hiking clothes, long pants, closed-toe shoes, layers for changing weather, and rain gear if necessary.
  • Bring your own lunch, plenty of water, binoculars (if available), pen/pencil, and field notebook/blank paper.

Contact Information

Eric Wrubel
(415) 331-5023 or