How many chill hours does 99640 get?

99640 averages 1210 chill hours per winter, ranging from 768 to 1559 across the last 10 years.

What hardiness zone is 99640?

99640 is in USDA hardiness zone 4a.

Location almanac

The short answer

99640 averages 1,210 chill hours per winter (768–1,559 across 10 years) in USDA zone 4a.

99640 climate
Average chill hours	1,210 (768–1,559 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically May 12 – May 26
First fall frost	typically September 13 – October 11

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 99640’s chill hours and zone:

Chill and zone requirements are comfortably met in 99640.

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How many chill hours does 99640 get?: 99640 averages 1210 chill hours per winter, ranging from 768 to 1559 across the last 10 years.
What hardiness zone is 99640?: 99640 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