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Chill hours in 56257

The short answer

56257 averages 1,164 chill hours per winter (7961,357 across 10 years) in USDA zone 4b.
56257 climate
Average chill hours1,164 (796–1,357 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 19 – April 29
First fall frosttypically October 14 – November 13

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 56257’s chill hours and zone:

How many chill hours does 56257 get?
56257 averages 1164 chill hours per winter, ranging from 796 to 1357 across the last 10 years.
What hardiness zone is 56257?
56257 is in USDA hardiness zone 4b.

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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