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Chill hours in 55329

The short answer

55329 averages 1,105 chill hours per winter (7981,403 across 10 years) in USDA zone 4b.
55329 climate
Average chill hours1,105 (798–1,403 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 22 – 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 55329’s chill hours and zone:

How many chill hours does 55329 get?
55329 averages 1105 chill hours per winter, ranging from 798 to 1403 across the last 10 years.
What hardiness zone is 55329?
55329 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