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Chill hours in T1W

The short answer

T1W averages 1,111 chill hours per winter (7061,371 across 10 years) in USDA zone 3b.
T1W climate
Average chill hours1,111 (706–1,371 across 10 winters)
USDA hardiness zone3b (NRCan zone 2b)
Last spring frosttypically May 24 – June 26
First fall frosttypically September 3 – September 18

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 T1W’s chill hours and zone:

How many chill hours does T1W get?
T1W averages 1111 chill hours per winter, ranging from 706 to 1371 across the last 10 years.
What hardiness zone is T1W?
T1W 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