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Chill hours in 56586

The short answer

56586 averages 1,008 chill hours per winter (6601,326 across 10 years) in USDA zone 4a.
56586 climate
Average chill hours1,008 (660–1,326 across 10 winters)
USDA hardiness zone4a
Last spring frosttypically April 25 – May 13
First fall frosttypically October 11 – November 12

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 56586’s chill hours and zone:

How many chill hours does 56586 get?
56586 averages 1008 chill hours per winter, ranging from 660 to 1326 across the last 10 years.
What hardiness zone is 56586?
56586 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