🥒🌱 When to Plant Courgettes in the UK

🥕 Introduction: Courgettes Need Warmth to Thrive

Courgettes are one of the most productive vegetables in UK gardens, but they are very sensitive to cold. Planting too early is the most common reason courgettes fail. To get strong plants and heavy harvests, it’s essential to know exactly when to plant courgettes in the UK and how to protect them from late frosts.

This guide explains when to sow courgettes, when to plant them outdoors, and how timing varies across the UK, so you can grow healthy plants and avoid early-season losses.

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• Courgette Seeds

Choose compact or bush varieties for best results.
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• Large Pots or Grow Bags

Courgettes need plenty of root space to crop well.
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• Garden Fleece or Cloches

Protect young courgette plants from cold nights.
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📅 When to Sow Courgette Seeds (UK)

🌱 Indoor Sowing (Recommended)

Best sowing time:
✔ April

Courgettes germinate quickly and don’t need an early start.

✔ sow indoors in pots or modules
✔ keep warm and bright
✔ avoid sowing too early

Early sowing (March) often leads to oversized, stressed plants before planting out.

🌱 Late Sowing Option

✔ sow in early May indoors
✔ plants catch up very quickly
✔ ideal for beginners

🌤️ When to Plant Courgettes Outdoors (UK)

🌱 Outdoor Planting Time

Best planting time:
✔ Late May to early June

Only plant courgettes outdoors when:

✔ all risk of frost has passed
✔ night temperatures stay above 10°C
✔ soil is warm and free-draining

This usually coincides with late May in southern areas and early June further north.

🌡️ Soil Temperature and Growing Conditions

Courgettes thrive in warm conditions.

✔ ideal soil temperature: 12–15°C or warmer
✔ rich, moisture-retentive soil
✔ full sun and shelter

Cold soil causes plants to stall or rot.

🌍 Regional Differences in the UK

Cold Areas (Scotland, northern England, higher ground)

✔ sow seeds in late April
✔ plant outdoors early June
✔ fleece often needed at night

Mild Areas (southern England, coastal regions)

✔ sow in early April
✔ plant outdoors mid to late May

Always use temperature, not dates, as your guide.

🪴 Growing Courgettes in Pots

Courgettes grow well in containers if sized correctly.

✔ use very large pots (at least 40–45 cm wide)
✔ one plant per pot
✔ water and feed regularly

Potted plants warm up faster and can be moved if needed.

❄️ What If Frost Hits After Planting?

Courgettes are not frost tolerant.

✔ even light frost can kill plants
✔ cover immediately with fleece
✔ replace plants if damaged

Never risk planting out before frost danger has passed.

🚫 Common Courgette Planting Mistakes

❌ sowing seeds too early
❌ planting outdoors before soil warms
❌ overcrowding plants
❌ poor watering during early growth

One healthy plant often produces more than enough courgettes.

🌟 FAQs

What month do you plant courgettes in the UK?

Seeds are usually sown in April, with plants set outdoors in late May or early June.

Can I sow courgettes directly outdoors?

Yes, in late May or June, once soil is warm.

Is it too late to plant courgettes in June?

No. Courgettes grow fast and still crop well.

Do courgettes need full sun?

Yes. Sun and warmth are essential for flowering and fruiting.

How long do courgettes take to produce fruit?

Usually 6–8 weeks from planting out.