How many chill hours does 99635 get?

99635 averages 532 chill hours per winter, ranging from 323 to 713 across the last 10 years.

What hardiness zone is 99635?

99635 is in USDA hardiness zone 4b.

Location almanac

The short answer

99635 averages 532 chill hours per winter (323–713 across 10 years) in USDA zone 4b.

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 99635’s chill hours and zone:

Chill and zone requirements are comfortably met in 99635.

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Possible in a good year or a favorable microclimate — click through for the caveats.

How many chill hours does 99635 get?: 99635 averages 532 chill hours per winter, ranging from 323 to 713 across the last 10 years.
What hardiness zone is 99635?: 99635 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