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Chill hours in 55806

The short answer

55806 averages 1,146 chill hours per winter (8761,576 across 10 years) in USDA zone 4b.
55806 climate
Average chill hours1,146 (876–1,576 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 23 – May 10
First fall frosttypically October 17 – 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 55806’s chill hours and zone:

How many chill hours does 55806 get?
55806 averages 1146 chill hours per winter, ranging from 876 to 1576 across the last 10 years.
What hardiness zone is 55806?
55806 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