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Chill hours in 57217

The short answer

57217 averages 1,074 chill hours per winter (6291,307 across 10 years) in USDA zone 4b.
57217 climate
Average chill hours1,074 (629–1,307 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 22 – May 10
First fall frosttypically October 7 – November 7

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 57217’s chill hours and zone:

How many chill hours does 57217 get?
57217 averages 1074 chill hours per winter, ranging from 629 to 1307 across the last 10 years.
What hardiness zone is 57217?
57217 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