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Chill hours in 55964

The short answer

55964 averages 1,254 chill hours per winter (1,0831,508 across 10 years) in USDA zone 4b.
55964 climate
Average chill hours1,254 (1,083–1,508 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 55964’s chill hours and zone:

How many chill hours does 55964 get?
55964 averages 1254 chill hours per winter, ranging from 1083 to 1508 across the last 10 years.
What hardiness zone is 55964?
55964 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