Skip to content
EveryOrchard
Menu

Location almanac

Chill hours in 91342

The short answer

91342 averages 1,116 chill hours per winter (6451,745 across 10 years) in USDA zone 10a.
91342 climate
Average chill hours1,116 (645–1,745 across 10 winters)
USDA hardiness zone10a
Last spring frosttypically February 4 – April 4
First fall frosttypically November 26 – December 18

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against 91342’s chill hours and zone:

How many chill hours does 91342 get?
91342 averages 1116 chill hours per winter, ranging from 645 to 1745 across the last 10 years.
What hardiness zone is 91342?
91342 is in USDA hardiness zone 10a.

Growing fruit trees in 91342? Get a care calendar anchored to this exact climate, with email reminders.

Start My Orchard

Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026