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Chill hours in 55330

The short answer

55330 averages 1,164 chill hours per winter (9651,443 across 10 years) in USDA zone 4b.
55330 climate
Average chill hours1,164 (965–1,443 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 25 – May 10
First fall frosttypically October 12 – 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 55330’s chill hours and zone:

How many chill hours does 55330 get?
55330 averages 1164 chill hours per winter, ranging from 965 to 1443 across the last 10 years.
What hardiness zone is 55330?
55330 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