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Chill hours in 56728

The short answer

56728 averages 898 chill hours per winter (5561,225 across 10 years) in USDA zone 3b.
56728 climate
Average chill hours898 (556–1,225 across 10 winters)
USDA hardiness zone3b
Last spring frosttypically April 29 – May 19
First fall frosttypically October 4 – October 16

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 56728’s chill hours and zone:

Marginal (1)

Possible in a good year or a favorable microclimate — click through for the caveats.

Marginal varieties for this location
VarietyFruit
CresthavenPeach
How many chill hours does 56728 get?
56728 averages 898 chill hours per winter, ranging from 556 to 1225 across the last 10 years.
What hardiness zone is 56728?
56728 is in USDA hardiness zone 3b.

Growing fruit trees in 56728? Get a care calendar anchored to this exact climate, with email reminders.

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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