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Chill hours in 55807

The short answer

55807 averages 1,104 chill hours per winter (8091,514 across 10 years) in USDA zone 4b.
55807 climate
Average chill hours1,104 (809–1,514 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 26 – May 10
First fall frosttypically October 17 – 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 55807’s chill hours and zone:

How many chill hours does 55807 get?
55807 averages 1104 chill hours per winter, ranging from 809 to 1514 across the last 10 years.
What hardiness zone is 55807?
55807 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