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Chill hours in 55992

The short answer

55992 averages 1,229 chill hours per winter (1,0461,492 across 10 years) in USDA zone 4b.
55992 climate
Average chill hours1,229 (1,046–1,492 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 26 – May 13
First fall frosttypically October 14 – October 28

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 55992’s chill hours and zone:

How many chill hours does 55992 get?
55992 averages 1229 chill hours per winter, ranging from 1046 to 1492 across the last 10 years.
What hardiness zone is 55992?
55992 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