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Chill hours in 55936

The short answer

55936 averages 1,201 chill hours per winter (1,0441,469 across 10 years) in USDA zone 4b.
55936 climate
Average chill hours1,201 (1,044–1,469 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 26 – May 13
First fall frosttypically October 12 – 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 55936’s chill hours and zone:

How many chill hours does 55936 get?
55936 averages 1201 chill hours per winter, ranging from 1044 to 1469 across the last 10 years.
What hardiness zone is 55936?
55936 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