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Chill hours in T4N

The short answer

T4N averages 1,132 chill hours per winter (7901,369 across 10 years) in USDA zone 3b.
T4N climate
Average chill hours1,132 (790–1,369 across 10 winters)
USDA hardiness zone3b (NRCan zone 3b)
Last spring frosttypically April 29 – May 22
First fall frosttypically September 28 – October 14

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 T4N’s chill hours and zone:

How many chill hours does T4N get?
T4N averages 1132 chill hours per winter, ranging from 790 to 1369 across the last 10 years.
What hardiness zone is T4N?
T4N 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