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Chill hours in 55810

The short answer

55810 averages 1,033 chill hours per winter (7151,425 across 10 years) in USDA zone 4b.
55810 climate
Average chill hours1,033 (715–1,425 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 27 – May 13
First fall frosttypically October 7 – November 19

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 55810’s chill hours and zone:

How many chill hours does 55810 get?
55810 averages 1033 chill hours per winter, ranging from 715 to 1425 across the last 10 years.
What hardiness zone is 55810?
55810 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