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Chill hours in 55767

The short answer

55767 averages 1,072 chill hours per winter (8441,417 across 10 years) in USDA zone 4a.
55767 climate
Average chill hours1,072 (844–1,417 across 10 winters)
USDA hardiness zone4a
Last spring frosttypically April 25 – May 10
First fall frosttypically October 11 – November 14

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 55767’s chill hours and zone:

How many chill hours does 55767 get?
55767 averages 1072 chill hours per winter, ranging from 844 to 1417 across the last 10 years.
What hardiness zone is 55767?
55767 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