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Chill hours in 54703

The short answer

54703 averages 1,244 chill hours per winter (1,0061,528 across 10 years) in USDA zone 4b.
54703 climate
Average chill hours1,244 (1,006–1,528 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 26 – May 13
First fall frosttypically October 12 – October 28

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 54703’s chill hours and zone:

How many chill hours does 54703 get?
54703 averages 1244 chill hours per winter, ranging from 1006 to 1528 across the last 10 years.
What hardiness zone is 54703?
54703 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