How many chill hours does 81251 get?

81251 averages 770 chill hours per winter, ranging from 602 to 949 across the last 10 years.

What hardiness zone is 81251?

81251 is in USDA hardiness zone 5a.

Location almanac

The short answer

81251 averages 770 chill hours per winter (602–949 across 10 years) in USDA zone 5a.

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 81251’s chill hours and zone:

Chill and zone requirements are comfortably met in 81251.

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

How many chill hours does 81251 get?: 81251 averages 770 chill hours per winter, ranging from 602 to 949 across the last 10 years.
What hardiness zone is 81251?: 81251 is in USDA hardiness zone 5a.

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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