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Chill hours in S4A

The short answer

S4A averages 1,040 chill hours per winter (6151,333 across 10 years) in USDA zone 4a.
S4A climate
Average chill hours1,040 (615–1,333 across 10 winters)
USDA hardiness zone4a (NRCan zone 3b)
Last spring frosttypically April 24 – May 14
First fall frosttypically October 5 – October 25

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 S4A’s chill hours and zone:

How many chill hours does S4A get?
S4A averages 1040 chill hours per winter, ranging from 615 to 1333 across the last 10 years.
What hardiness zone is S4A?
S4A is in USDA hardiness zone 4a.

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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