How many chill hours does 99631 get?

99631 averages 601 chill hours per winter, ranging from 370 to 803 across the last 10 years.

What hardiness zone is 99631?

99631 is in USDA hardiness zone 5a.

Location almanac

The short answer

99631 averages 601 chill hours per winter (370–803 across 10 years) in USDA zone 5a.

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 99631’s chill hours and zone:

Chill and zone requirements are comfortably met in 99631.

Show 68 more good fit varieties

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

Show 18 more marginal varieties

How many chill hours does 99631 get?: 99631 averages 601 chill hours per winter, ranging from 370 to 803 across the last 10 years.
What hardiness zone is 99631?: 99631 is in USDA hardiness zone 5a.

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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