What to Plant in August in Ontario
Your August planting guide for Ontario (USDA Zones 3–7, typically Zone 5). We've broken out activities by zone — jump to yours below.
Growing season varies across Zones 3–7 — 120–210 days. Pick the zone that matches your part of the state.
🏠
57
Start Indoors
🌿
162
Transplant Outdoors
🌱
591
Direct Sow
🧺
970
Harvest
Ontario · Zones 3–7
Zone 5 August guideZone 5 — August in Ontario★ Most of ON
835 varieties active · Last frost April 30 · 155-day season
🏠 Indoor 57🧺 Harvest 835
Zone 4 — August in Ontario
729 varieties active · Last frost May 10 · 135-day season
🏠 Indoor 57🧺 Harvest 729
Zone 6 — August in Ontario
911 varieties active · Last frost April 15 · 180-day season
🏠 Indoor 57🧺 Harvest 911
Zone 3 — August in Ontario
1337 varieties active · Last frost May 15 · 120-day season
🏠 Indoor 57🌿 Transplant 162🌱 Sow 591🧺 Harvest 609
Zone 7 — August in Ontario
962 varieties active · Last frost April 1 · 210-day season
🏠 Indoor 57🧺 Harvest 962
