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Chill hours in 55956

The short answer

55956 averages 1,250 chill hours per winter (1,0761,500 across 10 years) in USDA zone 4b.
55956 climate
Average chill hours1,250 (1,076–1,500 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 23 – April 28
First fall frosttypically October 14 – 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 55956’s chill hours and zone:

How many chill hours does 55956 get?
55956 averages 1250 chill hours per winter, ranging from 1076 to 1500 across the last 10 years.
What hardiness zone is 55956?
55956 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