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Chill hours in S0L

The short answer

S0L averages 1,012 chill hours per winter (5421,302 across 10 years) in USDA zone 4a.
S0L climate
Average chill hours1,012 (542–1,302 across 10 winters)
USDA hardiness zone4a (NRCan zone 3a)
Last spring frosttypically April 27 – May 18
First fall frosttypically September 28 – October 12

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 S0L’s chill hours and zone:

How many chill hours does S0L get?
S0L averages 1012 chill hours per winter, ranging from 542 to 1302 across the last 10 years.
What hardiness zone is S0L?
S0L 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