How Many Chill Hours Do Fruit Trees Need in Santa Cruz?
It depends on the tree and where you garden in the county. Most of Santa Cruz gets between 400 and 800 chill hours per winter, which is enough for many popular fruit trees but not all of them.
Chill hours are the total number of hours between 32F and 45F that accumulate during winter dormancy. Fruit trees need a certain threshold to break dormancy properly and set fruit. If they don't get enough, you'll see delayed leaf-out, poor bloom, and little to no fruit. The UC Davis Fruit and Nut Research Center maintains chill hour data and variety recommendations for California growers, and it is the best resource for matching varieties to your location.
In Santa Cruz County, your chill hours vary significantly by neighborhood. The coastal strip from Santa Cruz to Aptos typically gets 400 to 500 chill hours. Scotts Valley, Felton, and the San Lorenzo Valley average 600 to 800. Watsonville and the Pajaro Valley fall somewhere in between. This means a high-chill cherry variety (like Bing, which needs 700+ hours) may produce beautifully in Ben Lomond but disappoint near the coast.
For reliable fruit production, choose low-to-moderate chill varieties: Anna or Dorsett Golden apples (200 to 300 hours), Santa Rosa plum (300 hours), or Improved Dwarf fig (100 hours). If you're inland, you have more flexibility with mid-chill options like Fuji apple (400 to 500 hours) and Blenheim apricot (400 hours).
This week: Look up your approximate chill hours using the closest weather station on the UC IPM chill accumulation tool. This tells you exactly what to shop for during bare-root season.
Our free Planting Calendar lists fruit tree varieties by chill hour range so you can match trees to your specific microclimate.
