How many chill hours does 99781 get?

99781 averages 478 chill hours per winter, ranging from 303 to 608 across the last 10 years.

What hardiness zone is 99781?

99781 is in USDA hardiness zone 2b.

Location almanac

The short answer

99781 averages 478 chill hours per winter (303–608 across 10 years) in USDA zone 2b.

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 99781’s chill hours and zone:

Chill and zone requirements are comfortably met in 99781.

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

How many chill hours does 99781 get?: 99781 averages 478 chill hours per winter, ranging from 303 to 608 across the last 10 years.
What hardiness zone is 99781?: 99781 is in USDA hardiness zone 2b.

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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