How many chill hours does 99637 get?

99637 averages 1308 chill hours per winter, ranging from 800 to 1588 across the last 10 years.

What hardiness zone is 99637?

99637 is in USDA hardiness zone 4a.

Location almanac

The short answer

99637 averages 1,308 chill hours per winter (800–1,588 across 10 years) in USDA zone 4a.

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 99637’s chill hours and zone:

Chill and zone requirements are comfortably met in 99637.

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How many chill hours does 99637 get?: 99637 averages 1308 chill hours per winter, ranging from 800 to 1588 across the last 10 years.
What hardiness zone is 99637?: 99637 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