How many chill hours does 99651 get?

99651 averages 1152 chill hours per winter, ranging from 809 to 1443 across the last 10 years.

What hardiness zone is 99651?

99651 is in USDA hardiness zone 4b.

Location almanac

The short answer

99651 averages 1,152 chill hours per winter (809–1,443 across 10 years) in USDA zone 4b.

99651 climate
Average chill hours	1,152 (809–1,443 across 10 winters)
USDA hardiness zone	4b
Last spring frost	typically May 14 – June 2
First fall frost	typically September 21 – October 10

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 99651’s chill hours and zone:

Chill and zone requirements are comfortably met in 99651.

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How many chill hours does 99651 get?: 99651 averages 1152 chill hours per winter, ranging from 809 to 1443 across the last 10 years.
What hardiness zone is 99651?: 99651 is in USDA hardiness zone 4b.

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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