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Chill hours in T3N

The short answer

T3N averages 1,423 chill hours per winter (1,0221,695 across 10 years) in USDA zone 4a.
T3N climate
Average chill hours1,423 (1,022–1,695 across 10 winters)
USDA hardiness zone4a (NRCan zone 4a)
Last spring frosttypically April 24 – May 22
First fall frosttypically September 13 – October 7

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 T3N’s chill hours and zone:

How many chill hours does T3N get?
T3N averages 1423 chill hours per winter, ranging from 1022 to 1695 across the last 10 years.
What hardiness zone is T3N?
T3N 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