What to plant this week in Edmonton, AB
Edmonton gardeners are currently in deep winter dormancy, waiting patiently for the May 12 average last frost date to signal spring's true arrival. With hard freezes dropping as low as -30°F until late spring, all outdoor soil remains frozen and dormant right now.
The next 7 days
Edmonton, ABGrowing in Edmonton right now
- Leave bare flower beds completely uncovered; our heavy clay soil retains moisture that can freeze into damaging ice lenses if you try to work it now.
- Hold off on sowing any seeds or transplanting perennials until after May 12, as a late spring frost is still statistically possible in early May.
- Focus your energy indoors: start tender crops like tomatoes and peppers in seedling trays with bottom heat to give them a head start before our short growing season begins.
- Protect young saplings and shrubs with burlap wraps or tree guards now, as Edmonton's northerly winds can strip bark during this cold snap.
Sow this week
No direct sowing windows open this week.
Transplant this week
Nothing is due to go out this week.
Harvest soon
No harvest windows opening just yet.
Seasonal tips
- Finish mulching around perennials to protect crowns against late winter temperature swings.
- Test soil pH and amend beds now so nutrients are ready the moment you transplant in April.
- Start indoor seedlings of tomatoes, peppers, and eggplants under grow lights.
Pest & disease watch
- No outdoor pests are active right now due to sub-zero temperatures; wait until soil warms above 40°F for aphids or spider mites to appear.
- Watch for signs of winter damage on evergreens like spruce and arborvitae when the thaw begins, as desiccation from wind can kill new growth buds.
- Inspect seedling windowsills for fungus gnats once you start indoor propagation; these flies thrive in moist potting mix inside warm homes.
Watering this week
Keep soil lightly moist in active beds to prevent cracking, but avoid wetting dormant roots until growth resumes.
Clean up dead leaves from last season now to reduce overwintering disease spores.
Edmonton gardening questions
3Can I plant my vegetable garden now in Edmonton?
No, the ground is still frozen and the average last frost date isn't until May 12. Trying to push plants into cold soil will result in immediate frost damage or rot.
When should I stop watering my outdoor perennials this winter?
Stop all watering once the ground freezes solid, which usually happens by late November here. Resume only when the soil thaws completely after May 12.
What is the best way to protect tomatoes from our Edmonton spring frosts?
Start them indoors under lights now so they are large and hardy enough to survive the occasional freeze after May 12. Use row covers immediately upon transplanting outdoors as a safety net.
Other cities in zone 4a
2See the full zone 4a guide → · Plan your Edmonton garden in SproutGuide →