How many chill hours does 81631 get?

81631 averages 1198 chill hours per winter, ranging from 876 to 1536 across the last 10 years.

What hardiness zone is 81631?

81631 is in USDA hardiness zone 5b.

Location almanac

The short answer

81631 averages 1,198 chill hours per winter (876–1,536 across 10 years) in USDA zone 5b.

81631 climate
Average chill hours	1,198 (876–1,536 across 10 winters)
USDA hardiness zone	5b
Last spring frost	typically May 15 – May 30
First fall frost	typically September 24 – October 23

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 81631’s chill hours and zone:

Chill and zone requirements are comfortably met in 81631.

Show 122 more good fit varieties

How many chill hours does 81631 get?: 81631 averages 1198 chill hours per winter, ranging from 876 to 1536 across the last 10 years.
What hardiness zone is 81631?: 81631 is in USDA hardiness zone 5b.

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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