Skip to content
EveryOrchard
Menu

Location almanac

Chill hours in T1Z

The short answer

T1Z averages 1,409 chill hours per winter (1,0411,670 across 10 years) in USDA zone 4a.
T1Z climate
Average chill hours1,409 (1,041–1,670 across 10 winters)
USDA hardiness zone4a (NRCan zone 3b)
Last spring frosttypically April 26 – 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 T1Z’s chill hours and zone:

How many chill hours does T1Z get?
T1Z averages 1409 chill hours per winter, ranging from 1041 to 1670 across the last 10 years.
What hardiness zone is T1Z?
T1Z is in USDA hardiness zone 4a.

Growing fruit trees in T1Z? Get a care calendar anchored to this exact climate, with email reminders.

Start My Orchard

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