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Chill hours in 55811

The short answer

55811 averages 1,023 chill hours per winter (7171,419 across 10 years) in USDA zone 4b.
55811 climate
Average chill hours1,023 (717–1,419 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 27 – May 13
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 55811’s chill hours and zone:

How many chill hours does 55811 get?
55811 averages 1023 chill hours per winter, ranging from 717 to 1419 across the last 10 years.
What hardiness zone is 55811?
55811 is in USDA hardiness zone 4b.

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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