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Chill hours in 55929

The short answer

55929 averages 1,250 chill hours per winter (1,0941,501 across 10 years) in USDA zone 4b.
55929 climate
Average chill hours1,250 (1,094–1,501 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 26 – May 13
First fall frosttypically October 12 – 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 55929’s chill hours and zone:

How many chill hours does 55929 get?
55929 averages 1250 chill hours per winter, ranging from 1094 to 1501 across the last 10 years.
What hardiness zone is 55929?
55929 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