How many chill hours does 99790 get?

99790 averages 595 chill hours per winter, ranging from 378 to 892 across the last 10 years.

What hardiness zone is 99790?

99790 is in USDA hardiness zone 3b.

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The short answer

99790 averages 595 chill hours per winter (378–892 across 10 years) in USDA zone 3b.

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 99790’s chill hours and zone:

Chill and zone requirements are comfortably met in 99790.

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

How many chill hours does 99790 get?: 99790 averages 595 chill hours per winter, ranging from 378 to 892 across the last 10 years.
What hardiness zone is 99790?: 99790 is in USDA hardiness zone 3b.

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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