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Chill hours in 58561

The short answer

58561 averages 1,020 chill hours per winter (4901,263 across 10 years) in USDA zone 4a.
58561 climate
Average chill hours1,020 (490–1,263 across 10 winters)
USDA hardiness zone4a
Last spring frosttypically April 23 – May 20
First fall frosttypically October 7 – October 28

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 58561’s chill hours and zone:

How many chill hours does 58561 get?
58561 averages 1020 chill hours per winter, ranging from 490 to 1263 across the last 10 years.
What hardiness zone is 58561?
58561 is in USDA hardiness zone 4a.

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Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026