How many chill hours does 99791 get?

99791 averages 611 chill hours per winter, ranging from 290 to 777 across the last 10 years.

What hardiness zone is 99791?

99791 is in USDA hardiness zone 2a.

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The short answer

99791 averages 611 chill hours per winter (290–777 across 10 years) in USDA zone 2a.

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 99791’s chill hours and zone:

Chill and zone requirements are comfortably met in 99791.

Show 5 more good fit varieties

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

How many chill hours does 99791 get?: 99791 averages 611 chill hours per winter, ranging from 290 to 777 across the last 10 years.
What hardiness zone is 99791?: 99791 is in USDA hardiness zone 2a.

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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