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Chill hours in 55368

The short answer

55368 averages 1,150 chill hours per winter (9311,428 across 10 years) in USDA zone 4b.
55368 climate
Average chill hours1,150 (931–1,428 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 21 – May 3
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 55368’s chill hours and zone:

How many chill hours does 55368 get?
55368 averages 1150 chill hours per winter, ranging from 931 to 1428 across the last 10 years.
What hardiness zone is 55368?
55368 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