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Chill hours in 55912

The short answer

55912 averages 1,204 chill hours per winter (1,0771,438 across 10 years) in USDA zone 4b.
55912 climate
Average chill hours1,204 (1,077–1,438 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 25 – May 10
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 55912’s chill hours and zone:

How many chill hours does 55912 get?
55912 averages 1204 chill hours per winter, ranging from 1077 to 1438 across the last 10 years.
What hardiness zone is 55912?
55912 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