Calero County Park Wildflowers, 3/24/19 by Ronald Horii
Calero County Park has several areas with lots of wildflowers, most notably the Rancho San Vicente addition. However, it has a wildflower hotspot starting right at the Longwall Canyon Trailhead, next to the staging area for Rancho Canada del Oro Open Space Preserve. Here are some pictures of the wildflowers from the trailhead to the Baldy Ryan Creek Crossing.

Here's the Calero Map. Note the Casa Loma entrance at the bottom: https://www.sccgov.org/sites/parks/parkfinder/Documents/CaleroGuideMap.pdf

Here are more of my pictures of Calero County Park, including Rancho San Vicente: http://www.rhorii.com/#Calero-RanchoSanVicente
Calero is next to Rancho Canada del Oro Open Space Preserve. Guided hikes in Canada del Oro often go through Calero. Here are pictures: http://www.rhorii.com/#RCDO