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Chill hours in 55017

The short answer

55017 averages 1,128 chill hours per winter (9141,434 across 10 years) in USDA zone 4b.
55017 climate
Average chill hours1,128 (914–1,434 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 26 – May 13
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 55017’s chill hours and zone:

How many chill hours does 55017 get?
55017 averages 1128 chill hours per winter, ranging from 914 to 1434 across the last 10 years.
What hardiness zone is 55017?
55017 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