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Chill hours in T4T

The short answer

T4T averages 1,044 chill hours per winter (7871,280 across 10 years) in USDA zone 3a.
T4T climate
Average chill hours1,044 (787–1,280 across 10 winters)
USDA hardiness zone3a (NRCan zone 2b)
Last spring frosttypically June 1 – June 26
First fall frosttypically July 3 – September 16

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 T4T’s chill hours and zone:

How many chill hours does T4T get?
T4T averages 1044 chill hours per winter, ranging from 787 to 1280 across the last 10 years.
What hardiness zone is T4T?
T4T is in USDA hardiness zone 3a.

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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