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Chill hours in 56546

The short answer

56546 averages 1,044 chill hours per winter (7091,335 across 10 years) in USDA zone 4a.
56546 climate
Average chill hours1,044 (709–1,335 across 10 winters)
USDA hardiness zone4a
Last spring frosttypically April 28 – May 13
First fall frosttypically October 5 – 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 56546’s chill hours and zone:

How many chill hours does 56546 get?
56546 averages 1044 chill hours per winter, ranging from 709 to 1335 across the last 10 years.
What hardiness zone is 56546?
56546 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