Frost dates, chilling hours for Santa Clara County
I attended a great class this weekend with Nancy Garrison, a local fruit expert with the Santa Clara County Master Gardeners program. Here's some info she gave us:
- Last frost date for Santa Clara/San Mateo counties is mid-March to very early April
- Average chill hours have decreased considerably in the last few decades. In the early '70's, we had about 1200 chill hours on average, but now it's down to 400. She mentioned this makes it very difficult to grow cherries except for one or two varieties (Lapins included).
BTW, the class was held at Common Ground garden supply & education center in Palo Alto, which is a great local resource.