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Chill hours in 55910

The short answer

55910 averages 1,310 chill hours per winter (1,1341,568 across 10 years) in USDA zone 4b.
55910 climate
Average chill hours1,310 (1,134–1,568 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 23 – April 28
First fall frosttypically October 15 – November 14

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 55910’s chill hours and zone:

How many chill hours does 55910 get?
55910 averages 1310 chill hours per winter, ranging from 1134 to 1568 across the last 10 years.
What hardiness zone is 55910?
55910 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