How many chill hours does 81101 get?

81101 averages 1254 chill hours per winter, ranging from 1090 to 1548 across the last 10 years.

What hardiness zone is 81101?

81101 is in USDA hardiness zone 4b.

Location almanac

The short answer

81101 averages 1,254 chill hours per winter (1,090–1,548 across 10 years) in USDA zone 4b.

81101 climate
Average chill hours	1,254 (1,090–1,548 across 10 winters)
USDA hardiness zone	4b
Last spring frost	typically May 8 – May 25
First fall frost	typically September 27 – October 17

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 81101’s chill hours and zone:

Chill and zone requirements are comfortably met in 81101.

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How many chill hours does 81101 get?: 81101 averages 1254 chill hours per winter, ranging from 1090 to 1548 across the last 10 years.
What hardiness zone is 81101?: 81101 is in USDA hardiness zone 4b.

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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