How many chill hours does 99577 get?

99577 averages 640 chill hours per winter, ranging from 352 to 794 across the last 10 years.

What hardiness zone is 99577?

99577 is in USDA hardiness zone 5a.

Location almanac

The short answer

99577 averages 640 chill hours per winter (352–794 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 99577’s chill hours and zone:

Chill and zone requirements are comfortably met in 99577.

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

How many chill hours does 99577 get?: 99577 averages 640 chill hours per winter, ranging from 352 to 794 across the last 10 years.
What hardiness zone is 99577?: 99577 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