How many chill hours does 91731 get?

91731 averages 396 chill hours per winter, ranging from 227 to 771 across the last 10 years.

What hardiness zone is 91731?

91731 is in USDA hardiness zone 10b.

Location almanac

The short answer

91731 averages 396 chill hours per winter (227–771 across 10 years) in USDA zone 10b.

91731 climate
Average chill hours	396 (227–771 across 10 winters)
USDA hardiness zone	10b

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 91731’s chill hours and zone:

Chill and zone requirements are comfortably met in 91731.

Show 13 more good fit varieties

Possible in a good year or a favorable microclimate — click through for the caveats.

How many chill hours does 91731 get?: 91731 averages 396 chill hours per winter, ranging from 227 to 771 across the last 10 years.
What hardiness zone is 91731?: 91731 is in USDA hardiness zone 10b.

Growing fruit trees in 91731? Get a care calendar anchored to this exact climate, with email reminders.

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