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Chill hours in 55009

The short answer

55009 averages 1,237 chill hours per winter (1,0771,513 across 10 years) in USDA zone 4b.
55009 climate
Average chill hours1,237 (1,077–1,513 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 23 – April 28
First fall frosttypically October 15 – 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 55009’s chill hours and zone:

How many chill hours does 55009 get?
55009 averages 1237 chill hours per winter, ranging from 1077 to 1513 across the last 10 years.
What hardiness zone is 55009?
55009 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