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Chill hours in 55718

The short answer

55718 averages 1,073 chill hours per winter (7941,466 across 10 years) in USDA zone 4a.
55718 climate
Average chill hours1,073 (794–1,466 across 10 winters)
USDA hardiness zone4a
Last spring frosttypically April 27 – May 13
First fall frosttypically October 11 – November 2

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 55718’s chill hours and zone:

How many chill hours does 55718 get?
55718 averages 1073 chill hours per winter, ranging from 794 to 1466 across the last 10 years.
What hardiness zone is 55718?
55718 is in USDA hardiness zone 4a.

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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