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Chill hours in T2M

The short answer

T2M averages 1,349 chill hours per winter (9331,581 across 10 years) in USDA zone 4a.
T2M climate
Average chill hours1,349 (933–1,581 across 10 winters)
USDA hardiness zone4a (NRCan zone 4a)
Last spring frosttypically May 2 – May 22
First fall frosttypically September 13 – October 4

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 T2M’s chill hours and zone:

How many chill hours does T2M get?
T2M averages 1349 chill hours per winter, ranging from 933 to 1581 across the last 10 years.
What hardiness zone is T2M?
T2M 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