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Chill hours in 55951

The short answer

55951 averages 1,217 chill hours per winter (1,0671,471 across 10 years) in USDA zone 4b.
55951 climate
Average chill hours1,217 (1,067–1,471 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 55951’s chill hours and zone:

How many chill hours does 55951 get?
55951 averages 1217 chill hours per winter, ranging from 1067 to 1471 across the last 10 years.
What hardiness zone is 55951?
55951 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