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Chill hours in 58501

The short answer

58501 averages 1,079 chill hours per winter (5251,347 across 10 years) in USDA zone 4a.
58501 climate
Average chill hours1,079 (525–1,347 across 10 winters)
USDA hardiness zone4a
Last spring frosttypically April 20 – May 20
First fall frosttypically October 7 – October 27

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 58501’s chill hours and zone:

How many chill hours does 58501 get?
58501 averages 1079 chill hours per winter, ranging from 525 to 1347 across the last 10 years.
What hardiness zone is 58501?
58501 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