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Chill hours in T5S

The short answer

T5S averages 1,120 chill hours per winter (7581,329 across 10 years) in USDA zone 3b.
T5S climate
Average chill hours1,120 (758–1,329 across 10 winters)
USDA hardiness zone3b (NRCan zone 4a)
Last spring frosttypically April 26 – May 21
First fall frosttypically September 28 – October 15

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 T5S’s chill hours and zone:

How many chill hours does T5S get?
T5S averages 1120 chill hours per winter, ranging from 758 to 1329 across the last 10 years.
What hardiness zone is T5S?
T5S is in USDA hardiness zone 3b.

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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