How many chill hours does 81645 get?

81645 averages 547 chill hours per winter, ranging from 422 to 839 across the last 10 years.

What hardiness zone is 81645?

81645 is in USDA hardiness zone 5a.

Location almanac

The short answer

81645 averages 547 chill hours per winter (422–839 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 81645’s chill hours and zone:

Chill and zone requirements are comfortably met in 81645.

Show 63 more good fit varieties

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

Show 23 more marginal varieties

How many chill hours does 81645 get?: 81645 averages 547 chill hours per winter, ranging from 422 to 839 across the last 10 years.
What hardiness zone is 81645?: 81645 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