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Chill hours in T1L

The short answer

T1L averages 1,045 chill hours per winter (7681,347 across 10 years) in USDA zone 4a.
T1L climate
Average chill hours1,045 (768–1,347 across 10 winters)
USDA hardiness zone4a (NRCan zone 3a)
Last spring frosttypically May 25 – June 25
First fall frosttypically September 13 – September 22

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 T1L’s chill hours and zone:

How many chill hours does T1L get?
T1L averages 1045 chill hours per winter, ranging from 768 to 1347 across the last 10 years.
What hardiness zone is T1L?
T1L 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