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Chill hours in 55602

The short answer

55602 averages 979 chill hours per winter (6691,367 across 10 years) in USDA zone 3b.
55602 climate
Average chill hours979 (669–1,367 across 10 winters)
USDA hardiness zone3b
Last spring frosttypically May 3 – May 16
First fall frosttypically October 5 – November 1

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 55602’s chill hours and zone:

How many chill hours does 55602 get?
55602 averages 979 chill hours per winter, ranging from 669 to 1367 across the last 10 years.
What hardiness zone is 55602?
55602 is in USDA hardiness zone 3b.

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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