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Chill hours in S4W

The short answer

S4W averages 987 chill hours per winter (6151,345 across 10 years) in USDA zone 4a.
S4W climate
Average chill hours987 (615–1,345 across 10 winters)
USDA hardiness zone4a (NRCan zone 3a)
Last spring frosttypically May 1 – May 26
First fall frosttypically September 28 – October 14

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 S4W’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
ReliancePeach
How many chill hours does S4W get?
S4W averages 987 chill hours per winter, ranging from 615 to 1345 across the last 10 years.
What hardiness zone is S4W?
S4W is in USDA hardiness zone 4a.

Growing fruit trees in S4W? 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