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Chill hours in 54615

The short answer

54615 averages 1,321 chill hours per winter (1,1431,593 across 10 years) in USDA zone 4b.
54615 climate
Average chill hours1,321 (1,143–1,593 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 25 – May 13
First fall frosttypically October 13 – 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 54615’s chill hours and zone:

How many chill hours does 54615 get?
54615 averages 1321 chill hours per winter, ranging from 1143 to 1593 across the last 10 years.
What hardiness zone is 54615?
54615 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