Growing zones · Strathmore
Strathmore growing zone: zone 3b
Strathmore, Alberta is in plant hardiness zone 3b on the current Natural Resources Canada map (4th edition, based on 1991–2020 climate normals). The average last spring frost is around May 31 and the first fall frost around September 12, giving about 103 frost-free days at Gleichen, 30 km away.
Planting, hardiness and grow zone in Strathmore
"Growing zone", "planting zone" and "hardiness zone" all refer to the same thing in Canada: the plant hardiness zone, which predicts which perennials, trees and shrubs survive the winter. It does not tell you when to plant vegetables; frost dates do that.
Zone 3 covers most of central and northern settled Alberta. Prairie-bred fruit does well; tender perennials need protection.
- Haskap, saskatoon, raspberry and currants
- Sour cherries and hardy plums bred for the prairies
- Prairie-hardy apples such as Norland and Goodland on hardy rootstock
- Spruce, poplar, green ash and caragana for shelterbelts
- Cool-season vegetables; tomatoes and squash after the last frost, often started indoors
Buy perennials rated for zone 3b or colder. Cold-air pockets, low ground and exposed sites in and around Strathmore can run a full zone colder than the map.
Frost dates near Strathmore
Average dates from Environment and Climate Change Canada's 1991–2020 climate normals at the stations nearest Strathmore. Stations in towns usually show a longer season than open farmland nearby, which is why the numbers differ: nearby stations range from 103 to 122 frost-free days.
| Station | Distance | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|---|
| Gleichen | 30 km | May 31 | September 12 | 103 |
| Calgary International Airport | 44 km | May 21 | September 16 | 117 |
| Queenstown | 56 km | May 20 | September 20 | 122 |
Growing degree-days above 5 °C average about 1,533 a year at Gleichen (30 km), and total precipitation about 338 mm at Gleichen (30 km).
When to plant in Strathmore
- Cool-season crops (peas, spinach, lettuce, radish, potatoes) can go in a few weeks before the last frost, once the soil can be worked.
- Frost-tender crops (tomatoes, peppers, squash, beans, cucumbers) go out after the last frost, around May 31 on average, and many local gardeners wait an extra week.
- Trees, shrubs and perennials rated zone 3b or colder can be planted in spring or early fall.
Common questions
What growing zone is Strathmore, Alberta?
Strathmore is in Canadian plant hardiness zone 3b on Natural Resources Canada's current map (4th edition, 1991–2020 climate normals). Average frost dates there are about May 31 (last spring frost) and September 12 (first fall frost).
When is the last frost in Strathmore?
On average around May 31, based on Environment Canada's 1991–2020 normals at Gleichen. Frost can come later in low spots and in cold years, so many gardeners wait about a week past the average before planting tender crops.
Is Strathmore zone 3b on the USDA map?
Not necessarily. The USDA map uses only the average coldest winter temperature, while the Canadian map also weighs frost-free days, rain, snow cover and wind, so the two numbers often differ by about half a zone. Check which system a plant label uses.
Nearby places: Chestermere (4a) · Calgary (4a) · Airdrie (3b) · Okotoks (4a) · High River (4a) · Drumheller (3a)
Land around Strathmore: Wheatland County farm guide · Wheatland County hardiness zone · all Alberta growing zones · Canadian vs USDA zones explained
Sources: Natural Resources Canada, Plant Hardiness Zones of Canada (4th edition, 1991–2020); Environment and Climate Change Canada, Canadian Climate Normals 1991–2020. Page reviewed 2026-10-08.