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Chill hours in 55013

The short answer

55013 averages 1,170 chill hours per winter (9921,459 across 10 years) in USDA zone 4b.
55013 climate
Average chill hours1,170 (992–1,459 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 25 – May 13
First fall frosttypically October 17 – 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 55013’s chill hours and zone:

How many chill hours does 55013 get?
55013 averages 1170 chill hours per winter, ranging from 992 to 1459 across the last 10 years.
What hardiness zone is 55013?
55013 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