Where to photograph in California – Yahoo Groups (Calphotos) has a report
There was a nice showing of poppies on the hills at Lake Street on Hwy. 15 just north of Lake Elsinore today.
Walker Canyon near Lake Elsinore. Exit at Lake St on hwy15. Follow the Walker Canyon road, you will soon find the spot. Walk deeper into the canyon you will find tons of flowers in patches, many of them very dense and just by the trail. But be careful since trails are not well marked. Make sure to go when the sunshine is strong to see these poppies fully open.
See photos at http://www.desertusa.com/wildflo/ca.html#ixzz4aPARTQXy