How many chill hours does 91390 get?

91390 averages 987 chill hours per winter, ranging from 574 to 1484 across the last 10 years.

What hardiness zone is 91390?

91390 is in USDA hardiness zone 9b.

Location almanac

The short answer

91390 averages 987 chill hours per winter (574–1,484 across 10 years) in USDA zone 9b.

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 91390’s chill hours and zone:

Chill and zone requirements are comfortably met in 91390.

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How many chill hours does 91390 get?: 91390 averages 987 chill hours per winter, ranging from 574 to 1484 across the last 10 years.
What hardiness zone is 91390?: 91390 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