How many chill hours does 99641 get?

99641 averages 1269 chill hours per winter, ranging from 795 to 1537 across the last 10 years.

What hardiness zone is 99641?

99641 is in USDA hardiness zone 4a.

Location almanac

The short answer

99641 averages 1,269 chill hours per winter (795–1,537 across 10 years) in USDA zone 4a.

99641 climate
Average chill hours	1,269 (795–1,537 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically April 28 – May 28
First fall frost	typically September 24 – October 16

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 99641’s chill hours and zone:

Chill and zone requirements are comfortably met in 99641.

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How many chill hours does 99641 get?: 99641 averages 1269 chill hours per winter, ranging from 795 to 1537 across the last 10 years.
What hardiness zone is 99641?: 99641 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