Courgettes need warmth and frost-free conditions — get the timing right and you'll have more than you can eat from July to October.
Ready to start growing? Read our full How to Grow Courgettes UK →
Sowing dates and growing advice verified against RHS guidance by the SoilCommander Growing Team.
Part of the UK Vegetable Planting Calendar — see all sowing dates and monthly guides.
⚠️ Courgettes cannot tolerate any frost. Never plant outdoors until all frost risk has passed and soil reaches at least 12°C.
Sowing & Planting Dates
| Method | When | Notes |
|---|---|---|
| Sow indoors | March–April | 18–21°C, sow seed on its edge |
| Transplant outdoors | Late May–June | After last frost, harden off first |
| Direct sow outdoors | Late May–June | Only when soil is 15°C+ |
| Harvest | July–October | Pick at 10–15cm; pick frequently |
Browse all sowing dates in the UK vegetable planting calendar · Explore all UK vegetable growing guides
Plan The Timing Before You Sow
Use the planting window with a planner, seed-starting setup, and the full calendar so dates stay practical for your garden.
Plan the next step
Use the printable UK Vegetable Garden Planner to turn this guide into sowing dates, bed layouts, and weekly garden tasks.