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Chill hours in T0M

The short answer

T0M averages 1,296 chill hours per winter (9661,570 across 10 years) in USDA zone 3b.
T0M climate
Average chill hours1,296 (966–1,570 across 10 winters)
USDA hardiness zone3b (NRCan zone 3a)
Last spring frosttypically May 2 – May 21
First fall frosttypically September 22 – October 13

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 T0M’s chill hours and zone:

How many chill hours does T0M get?
T0M averages 1296 chill hours per winter, ranging from 966 to 1570 across the last 10 years.
What hardiness zone is T0M?
T0M 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