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Chill hours in T3S

The short answer

T3S averages 1,367 chill hours per winter (1,0211,650 across 10 years) in USDA zone 4a.
T3S climate
Average chill hours1,367 (1,021–1,650 across 10 winters)
USDA hardiness zone4a (NRCan zone 4a)
Last spring frosttypically May 2 – May 27
First fall frosttypically September 14 – 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 T3S’s chill hours and zone:

How many chill hours does T3S get?
T3S averages 1367 chill hours per winter, ranging from 1021 to 1650 across the last 10 years.
What hardiness zone is T3S?
T3S 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