AEOE Calendar of Events - go here to see a huge variety of conferences and workshops offered throughout the year, mainly in CA. You can even submit an event to be posted!
American Museum of Natural History - Seminars on Science, on-line courses
Annenberg Learner - a myriad of courses, lesson plans, and resources for all subjects and grades
CA Academy of Sciences - offers workshops and teaching kits for teachers, exhibit guides, the "Teachers' Lounge" resource page, and teacher memberships.
EEI Curriculum - California's groundbreaking, first-in-the nation K-12 environmental education curriculum.
Elkhorn Slough - offers 1-day teacher workshops that enables you to "content and experientially rich field trip at Elkhorn Slough Reserve."
Monterey Bay Aquarium - offers a variety of training programs for teachers: summits, institutes, and an open house where you get to spend the night in the aquarium!
Regenerative Design Institute - offers courses on permaculture and more.
Wilderness Awareness School - offers day, week, or year long training programs and home study courses (Kamana Naturalist Program) that "combine ancient and modern ecological wisdom, and empower people of all ages to become stewards, mentors and leaders.".