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Chill hours in 54103

The short answer

54103 averages 1,121 chill hours per winter (8111,490 across 10 years) in USDA zone 4b.
54103 climate
Average chill hours1,121 (811–1,490 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically May 3 – May 14
First fall frosttypically October 10 – October 29

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 54103’s chill hours and zone:

How many chill hours does 54103 get?
54103 averages 1121 chill hours per winter, ranging from 811 to 1490 across the last 10 years.
What hardiness zone is 54103?
54103 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