How many chill hours does 59231 get?

59231 averages 1168 chill hours per winter, ranging from 629 to 1356 across the last 10 years.

What hardiness zone is 59231?

59231 is in USDA hardiness zone 4a.

Location almanac

The short answer

59231 averages 1,168 chill hours per winter (629–1,356 across 10 years) in USDA zone 4a.

59231 climate
Average chill hours	1,168 (629–1,356 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically April 28 – May 18
First fall frost	typically September 28 – October 14

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 59231’s chill hours and zone:

Chill and zone requirements are comfortably met in 59231.

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How many chill hours does 59231 get?: 59231 averages 1168 chill hours per winter, ranging from 629 to 1356 across the last 10 years.
What hardiness zone is 59231?: 59231 is in USDA hardiness zone 4a.

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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