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Chill hours in T1S

The short answer

T1S averages 1,426 chill hours per winter (1,0681,738 across 10 years) in USDA zone 4a.
T1S climate
Average chill hours1,426 (1,068–1,738 across 10 winters)
USDA hardiness zone4a (NRCan zone 4a)
Last spring frosttypically May 2 – May 22
First fall frosttypically September 13 – October 7

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 T1S’s chill hours and zone:

How many chill hours does T1S get?
T1S averages 1426 chill hours per winter, ranging from 1068 to 1738 across the last 10 years.
What hardiness zone is T1S?
T1S 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