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Chill hours in 56243

The short answer

56243 averages 1,077 chill hours per winter (6941,373 across 10 years) in USDA zone 4b.
56243 climate
Average chill hours1,077 (694–1,373 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 22 – May 10
First fall frosttypically October 11 – November 19

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 56243’s chill hours and zone:

How many chill hours does 56243 get?
56243 averages 1077 chill hours per winter, ranging from 694 to 1373 across the last 10 years.
What hardiness zone is 56243?
56243 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