How many chill hours does 99580 get?

99580 averages 1548 chill hours per winter, ranging from 906 to 2237 across the last 10 years.

What hardiness zone is 99580?

99580 is in USDA hardiness zone 4b.

Location almanac

The short answer

99580 averages 1,548 chill hours per winter (906–2,237 across 10 years) in USDA zone 4b.

99580 climate
Average chill hours	1,548 (906–2,237 across 10 winters)
USDA hardiness zone	4b
Last spring frost	typically May 3 – May 18
First fall frost	typically September 22 – October 15

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 99580’s chill hours and zone:

Chill and zone requirements are comfortably met in 99580.

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How many chill hours does 99580 get?: 99580 averages 1548 chill hours per winter, ranging from 906 to 2237 across the last 10 years.
What hardiness zone is 99580?: 99580 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