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Chill hours in 54121

The short answer

54121 averages 1,144 chill hours per winter (8261,522 across 10 years) in USDA zone 4b.
54121 climate
Average chill hours1,144 (826–1,522 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 28 – May 14
First fall frosttypically October 13 – October 27

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 54121’s chill hours and zone:

How many chill hours does 54121 get?
54121 averages 1144 chill hours per winter, ranging from 826 to 1522 across the last 10 years.
What hardiness zone is 54121?
54121 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