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Chill hours in 56688

The short answer

56688 averages 962 chill hours per winter (7031,229 across 10 years) in USDA zone 3b.
56688 climate
Average chill hours962 (703–1,229 across 10 winters)
USDA hardiness zone3b
Last spring frosttypically April 29 – May 16
First fall frosttypically October 7 – October 27

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 56688’s chill hours and zone:

How many chill hours does 56688 get?
56688 averages 962 chill hours per winter, ranging from 703 to 1229 across the last 10 years.
What hardiness zone is 56688?
56688 is in USDA hardiness zone 3b.

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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