How many chill hours does 99740 get?

99740 averages 475 chill hours per winter, ranging from 286 to 598 across the last 10 years.

What hardiness zone is 99740?

99740 is in USDA hardiness zone 3a.

Location almanac

The short answer

99740 averages 475 chill hours per winter (286–598 across 10 years) in USDA zone 3a.

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 99740’s chill hours and zone:

Chill and zone requirements are comfortably met in 99740.

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

How many chill hours does 99740 get?: 99740 averages 475 chill hours per winter, ranging from 286 to 598 across the last 10 years.
What hardiness zone is 99740?: 99740 is in USDA hardiness zone 3a.

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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