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Chill hours in 56628

The short answer

56628 averages 966 chill hours per winter (7121,251 across 10 years) in USDA zone 3b.
56628 climate
Average chill hours966 (712–1,251 across 10 winters)
USDA hardiness zone3b
Last spring frosttypically April 29 – May 16
First fall frosttypically October 7 – November 7

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 56628’s chill hours and zone:

How many chill hours does 56628 get?
56628 averages 966 chill hours per winter, ranging from 712 to 1251 across the last 10 years.
What hardiness zone is 56628?
56628 is in USDA hardiness zone 3b.

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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