Calphoto has a wildflower posting for Ring Mt.:
A good showing of wildflowers on Ring Mountain Preserve in Corte Madera, Marin County. Many still in bud so will last a while especially with the new rains. Got 3/4″ last night in Sausalito. Middle of the mountain has early irises with lots of butter cups and Oakland Star Lillies and some checkerbloom. Towards the top of the hill lots of tidy tips and blue eyes grass, some goldfields left, clusters of cream cups, blue dicks, poppies, lupines, and phacelia. Occasional red maid and shooting star. Tiburon Mariposa Lilies are a long way off. Only saw one bud. Large area fenced off because of study of a burn area from last year's fire. Looking very healthy with new grass and flowers.
To see more wildlflower reports go to calphoto.
Typically Tiburon Mariposa Lilies don't bloom until the end of May beginning of June. Here is a post I did two years ago with photos of Tiburon Mariposa Lilies: Ring Mountain Wildflower Report 5/29/11 – updated 6/1/11 | Natural History Wanderings
Natural History Wanderings 
Hi Sandy: Joe Willis, blackoaknaturalist, here. I notice that in a recent post you gave a plug for the summer program at the SF State (or was it USF?) forestry camp. It occurred to me that possibly you’d be willing to give a plug for the Feather River Art Camp at which I teach a one-week course called Adventures in Nature Journaling. You can check it out at featherriverartcamp.com. The director is Karen LeGault, and the camp runs from June 16 though 23 on the grounds of the Oakland Feather River Camp just outside Quincy. Karen puts out a newsletter several times a year promoting the camp, and her recent edition did a great job of promoting my class. There are round a dozen classes to choose from, each taught by a known Bay Area artist in various media from water color, oils, glass bead making, and ceramics. All are intensely nature oriented in keeping with the surroundings. If you have any questions about the camp email me or the director, Karen.
I’ve taught the class the past two summers. It involved nature hikes with journaling, and the students can emphasize writing, sketching, photography, or any combination that suits them, with the goal of creating a journal that captures the nature experience. The week culminates with a public-invited showing of the work of students and instructors. Thanks, Joe Willis PS: I’ve been enjoying your many posts greatly, especially on areas I’ve visited over the years but am not able to visit every year, like Anza-Borrego, and West Texas.
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By: Joe Willis on April 4, 2013
at 3:50 PM
See post this Sunday about Joe’s Nature Journaling class.
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By: Sandy Steinman on April 4, 2013
at 9:19 PM