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Chill hours in T8W

The short answer

T8W averages 1,273 chill hours per winter (9851,556 across 10 years) in USDA zone 3a.
T8W climate
Average chill hours1,273 (985–1,556 across 10 winters)
USDA hardiness zone3a (NRCan zone 3a)
Last spring frosttypically April 26 – May 20
First fall frosttypically September 22 – October 21

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 T8W’s chill hours and zone:

How many chill hours does T8W get?
T8W averages 1273 chill hours per winter, ranging from 985 to 1556 across the last 10 years.
What hardiness zone is T8W?
T8W is in USDA hardiness zone 3a.

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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