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Chill hours in S0N

The short answer

S0N averages 1,291 chill hours per winter (7441,528 across 10 years) in USDA zone 4a.
S0N climate
Average chill hours1,291 (744–1,528 across 10 winters)
USDA hardiness zone4a (NRCan zone 4a)
Last spring frosttypically April 28 – May 21
First fall frosttypically September 28 – October 23

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 S0N’s chill hours and zone:

How many chill hours does S0N get?
S0N averages 1291 chill hours per winter, ranging from 744 to 1528 across the last 10 years.
What hardiness zone is S0N?
S0N is in USDA hardiness zone 4a.

Growing fruit trees in S0N? 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