May in Zone 7 is warm, fast and generous. The last frost — average Mar 15–Apr 1 — is well behind you, the soil is warm, and the garden is in full growth. It is the month when spring planting finishes, summer crops take off, and the first tomatoes start to set fruit.
What May means in Zone 7
Zone 7 is a generous gardening zone: average annual minimum temperatures of 0 to 10°F mean winters are cold but rarely brutal, and the frost-free season stretches long enough for two full rounds of many crops. The frost-free season lasts about seven months, from late March into early November. The average last spring frost falls in the Mar 15–Apr 1 range and the average first autumn frost in the Nov 1–15 range — USDA zone averages, not exact dates, so check your local extension service before planting tender crops outside. Our planting calendar by ZIP turns them into a month-by-month plan.
With about seven frost-free months in the year, Zone 7 May is about planting the heat lovers and keeping everything watered and fed. Sweet potatoes, okra and peppers all need May's warmth, and succession sowing keeps the harvest coming all summer. At the same time, the cool-season crops sown in February and March — peas, lettuce, broccoli and radishes — are finishing, so May is the month the garden changes hands from spring crops to summer crops.
May task list
- Transplant sweet potato slips and any remaining peppers, eggplant and basil. 2. Direct-sow beans, corn, squash, cucumbers and okra; succession-sow beans every two weeks. 3. Mulch everything with 2–3 inches of straw to hold moisture as days warm. 4. Water deeply in the morning; containers dry out fast now. 5. Side-dress corn and tomatoes with compost. 6. Watch for aphids, flea beetles and cucumber beetles on young plants.
What to start indoors now
Indoor starting is nearly finished in May, but a few jobs remain. Start a second round of cucumbers and zucchini indoors for succession planting, and start winter squash and pumpkins indoors in early May for the longest possible season — they need 90–120 days to mature. Start herbs like basil indoors if you have not already, and start fall brassicas indoors in late May if you want an early start on the autumn garden. Use clean pots and fresh seed-starting mix, give seedlings strong light, and keep the soil moist but never waterlogged. Work out exact sowing dates with the seed-starting calculator.
What to direct-sow outdoors
Direct sow green beans (50–65 days), sweet corn (60–90 days), zucchini (45–55 days), cucumbers (50–70 days), okra (50–65 days) and pumpkins (90–120 days) now that the soil is thoroughly warm. Sow carrots (60–80 days) and beets (50–70 days) for summer harvest, and keep sowing lettuce in afternoon shade — it bolts fast in May heat. Sow dill, cilantro and parsley outdoors too, and sow a second round of beans every two weeks for a continuous harvest. Prepare the bed first — fork it over, remove weeds, rake it level — then sow thinly, water gently, and thin seedlings to the spacing in the table below.
What to transplant now
Transplant sweet potato slips in May, once the soil is thoroughly warm — sweet potatoes need 90–120 days and love heat. Transplant any remaining peppers, eggplant and basil, and set out okra seedlings started indoors in April. Transplant fall brassica seedlings started in late May only if they are sturdy; most Zone 7 gardeners start fall brassicas in June or July. Water all transplants deeply at planting time and mulch around them. Harden seedlings off for a week first, plant on a cloudy day or in the evening, water them in well, and mulch around — but not against — the stems.
What to harvest this month
May harvests are the best of both seasons: peas at their peak, lettuce, spinach, radishes, scallions and spring broccoli finishing, and the first zucchini and cucumbers appearing by late May. Pick peas daily once pods fill out — they turn starchy fast. Harvest herbs in the morning, when their oils are strongest, and cut lettuce as outer leaves to keep plants producing a little longer in the warming days. Harvest in the morning, when plants are cool and crisp, and pick little and often — regular picking keeps most vegetables producing.
Frost protection in Zone 7
Frost is not a May worry in Zone 7 — the average first frost is Nov 1–15, and the last frost was Mar 15–Apr 1 — but heat is. Mulch, deep watering and afternoon shade for lettuce are May's version of frost protection. If a freak cold night is forecast, frost cloth works, but it is rarely needed. The real risk now is a heatwave stressing young transplants, so water in the morning and shade new plantings for their first few days. When a cold night is forecast, water the soil in the afternoon, cover tender plants with frost cloth before sunset, and remove the covers in the morning. The Plant Spacing Calculator can help you time plantings around your frost dates.
Planting data for May in Zone 7
All figures below are broad published ranges from standard horticultural references, not exact figures — they vary by variety, climate and soil.
| Crop | Action this month | Days to maturity | Notes |
|---|---|---|---|
| Sweet potatoes | Transplant slips | 90–120 | Needs warm soil; loves heat |
| Green beans | Direct sow | 50–65 | Succession-sow every 2 weeks |
| Okra | Direct sow / transplant | 50–65 | Needs warm soil; soak seed overnight |
| Peas | Harvest | 60–70 | Pick daily; pods turn starchy fast |
| Zucchini | Direct sow / harvest | 45–55 | Pick small for best flavour |
| Pumpkins | Direct sow | 90–120 | Needs the full season to mature |
Browse the full planting calendar hub for every Zone 7 month, and see the neighbouring months in this zone:
Frequently asked questions
What should I plant in May in Zone 7?
Sweet potato slips, okra, beans, sweet corn, zucchini, cucumbers and pumpkins, plus succession sowings of beans and lettuce in shade. Transplant any remaining peppers, eggplant and basil.
When can I plant sweet potatoes in Zone 7?
In May, once the soil is thoroughly warm. Sweet potatoes need 90–120 days and love heat — plant slips deeply, keep them watered until they run, and then let the vines spread.
What can I harvest in May in Zone 7?
Peas, lettuce, spinach, radishes, scallions, spring broccoli, and the first zucchini and cucumbers by late May. Peas are the highlight — pick them daily while the pods are still sweet.
Why is my lettuce bolting in May?
Lettuce bolts in heat. Sow it in afternoon shade, water it well, and pick it young. In Zone 7, May lettuce is the last spring sowing — the next round goes in late summer for autumn.
How often should I water in May in Zone 7?
Water deeply two or three times a week rather than a little every day, and water in the morning so leaves dry before night. Mulch helps enormously — 2–3 inches of straw keeps soil moisture steady as days warm.