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Chill hours in T1P

The short answer

T1P averages 1,372 chill hours per winter (1,0081,635 across 10 years) in USDA zone 4a.
T1P climate
Average chill hours1,372 (1,008–1,635 across 10 winters)
USDA hardiness zone4a (NRCan zone 3b)
Last spring frosttypically April 29 – May 20
First fall frosttypically September 28 – October 23

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 T1P’s chill hours and zone:

How many chill hours does T1P get?
T1P averages 1372 chill hours per winter, ranging from 1008 to 1635 across the last 10 years.
What hardiness zone is T1P?
T1P 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