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Chill hours in 55768

The short answer

55768 averages 963 chill hours per winter (6661,303 across 10 years) in USDA zone 3b.
55768 climate
Average chill hours963 (666–1,303 across 10 winters)
USDA hardiness zone3b
Last spring frosttypically April 29 – May 16
First fall frosttypically October 12 – November 2

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 55768’s chill hours and zone:

How many chill hours does 55768 get?
55768 averages 963 chill hours per winter, ranging from 666 to 1303 across the last 10 years.
What hardiness zone is 55768?
55768 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