How many chill hours does 91980 get?

91980 averages 675 chill hours per winter, ranging from 366 to 1137 across the last 10 years.

What hardiness zone is 91980?

91980 is in USDA hardiness zone 9b.

Location almanac

The short answer

91980 averages 675 chill hours per winter (366–1,137 across 10 years) in USDA zone 9b.

91980 climate
Average chill hours	675 (366–1,137 across 10 winters)
USDA hardiness zone	9b
Last spring frost	typically January 26 – March 2
First fall frost	typically December 8 – December 30

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 91980’s chill hours and zone:

Chill and zone requirements are comfortably met in 91980.

Show 55 more good fit varieties

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

Show 2 more marginal varieties

How many chill hours does 91980 get?: 91980 averages 675 chill hours per winter, ranging from 366 to 1137 across the last 10 years.
What hardiness zone is 91980?: 91980 is in USDA hardiness zone 9b.

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[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