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Chill hours in 56450

The short answer

56450 averages 1,043 chill hours per winter (7871,398 across 10 years) in USDA zone 4a.
56450 climate
Average chill hours1,043 (787–1,398 across 10 winters)
USDA hardiness zone4a
Last spring frosttypically April 23 – May 10
First fall frosttypically October 12 – 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 56450’s chill hours and zone:

How many chill hours does 56450 get?
56450 averages 1043 chill hours per winter, ranging from 787 to 1398 across the last 10 years.
What hardiness zone is 56450?
56450 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