How many chill hours does 97131 get?

97131 averages 1908 chill hours per winter, ranging from 1620 to 2381 across the last 10 years.

What hardiness zone is 97131?

97131 is in USDA hardiness zone 8b.

Location almanac

The short answer

97131 averages 1,908 chill hours per winter (1,620–2,381 across 10 years) in USDA zone 8b.

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 97131’s chill hours and zone:

Chill and zone requirements are comfortably met in 97131.

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How many chill hours does 97131 get?: 97131 averages 1908 chill hours per winter, ranging from 1620 to 2381 across the last 10 years.
What hardiness zone is 97131?: 97131 is in USDA hardiness zone 8b.

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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