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Chill hours in S4H

The short answer

S4H averages 1,046 chill hours per winter (6421,373 across 10 years) in USDA zone 4a.
S4H climate
Average chill hours1,046 (642–1,373 across 10 winters)
USDA hardiness zone4a (NRCan zone 3b)
Last spring frosttypically May 1 – May 19
First fall frosttypically September 21 – October 15

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023 / NRCan 1981–2010. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against S4H’s chill hours and zone:

How many chill hours does S4H get?
S4H averages 1046 chill hours per winter, ranging from 642 to 1373 across the last 10 years.
What hardiness zone is S4H?
S4H is in USDA hardiness zone 4a.

Growing fruit trees in S4H? 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] Natural Resources Canada. Plant Hardiness Zones of Canada — accessed July 2026