How many chill hours does 99681 get?

99681 averages 1083 chill hours per winter, ranging from 826 to 1383 across the last 10 years.

What hardiness zone is 99681?

99681 is in USDA hardiness zone 4a.

Location almanac

The short answer

99681 averages 1,083 chill hours per winter (826–1,383 across 10 years) in USDA zone 4a.

99681 climate
Average chill hours	1,083 (826–1,383 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically May 14 – June 2
First fall frost	typically September 27 – October 15

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 99681’s chill hours and zone:

Chill and zone requirements are comfortably met in 99681.

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How many chill hours does 99681 get?: 99681 averages 1083 chill hours per winter, ranging from 826 to 1383 across the last 10 years.
What hardiness zone is 99681?: 99681 is in USDA hardiness zone 4a.

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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