May is the month most gardeners wait all year for, and the garden tasks in May are the ones that set up the whole summer. The last frost passes for most of the country, tender plants finally go outside for good, and the garden changes from bare beds to a green, growing place in a matter of weeks. The risk in May is over-planting before the soil has truly warmed, and under-watering once the sun gets strong. This guide splits the work by zone band — cold zones 1–4, temperate zones 5–7, warm zones 8–10, and frost-free zones 11–13. Frost dates are given only as averages and ranges, never as exact dates for a particular place, and zones 11–13 are frost-free, so their calendar runs on heat and rain instead. Before you act on any timing here, check your local extension service for the frost dates and sowing windows that fit your area.
Cold zones 1–4: planting out begins at last
In zones 1–4, average last frost dates fall roughly from late May into June, so May is planting-out month, but only in its second half for the tenderest crops. Seed starting indoors is finishing: start cucumbers, squash and melons indoors early in May for transplanting later, and keep tomatoes, peppers and eggplant growing on under lights until they can go out. Harden off seedlings for a week before planting, putting them outside by day and bringing them in at night. Use our seed-starting calculator to confirm your dates.
Direct sowing outdoors opens wide: peas, lettuce, spinach, kale, radishes, beets, carrots, turnips, onions, potatoes and beans late in the month once the soil has warmed. Sow lettuce and radishes little and often, and see the lettuce growing guide for succession tips. Transplanting is the headline job: set out broccoli, cabbage, cauliflower, lettuce, kale and onion seedlings early in the month, and plant out tomatoes, peppers, eggplant and basil after the average last frost, with fleece handy for a cold night. Plant them deep, water them in well, and mulch around them once the soil has warmed. Pruning is light now: remove dead wood, deadhead spring bulbs as they fade, and do not prune spring-flowering shrubs until after they bloom. Fertilising starts in earnest: feed vegetable beds with compost, feed roses and fruit trees, and feed lawns that are growing strongly. Pest and disease watch means slugs and snails on young transplants, aphids on roses, and cabbage worms on brassicas — check plants every few days and act early. Watering becomes a real job: water new transplants deeply, water in the morning, and mulch beds to hold moisture. Harvesting improves fast: asparagus, rhubarb, lettuce, spinach, radishes, spring onions and herbs, and our harvest date calculator can help time the first pickings. Soil and compost work means mulching beds once the soil is warm, turning the heap, and adding compost to beds between plantings. Houseplant care is summer care now: plants can go outside on warm days, feed regularly, repot anything root-bound, and watch for aphids on soft growth.
Temperate zones 5–7: tender crops out and summer sowing
Zones 5–7, with average last frost dates generally from mid-April to mid-May, make May the month tender crops go out for good. Seed starting indoors is nearly done, though you can still start late cucumbers, squash and herbs, and start fall brassicas indoors late in the month for transplanting in summer.
Direct sowing outdoors is broad: beans, squash, zucchini, cucumbers, corn, okra in zone 7, melons, carrots, beets, lettuce and herbs all go in now. Transplanting is the main event: plant out tomatoes, peppers, eggplant, basil and cucurbits after the average last frost, stake tomatoes at planting time, and set out sweet potato slips in zone 7. See the tomato growing guide and sweet corn growing guide for spacing and feeding. Pruning is tidying: deadhead spring flowers, cut back dead perennial growth, pinch out tomato side shoots, and shape shrubs after flowering. Our pruning calendar covers the timing. Fertilising is regular: feed vegetables every few weeks, feed roses, fruit trees and citrus, and side-dress corn and squash as they grow. Pest and disease watch steps up: aphids, slugs, cabbage worms, cucumber beetles and early blight all appear in May, so inspect weekly and remove affected leaves promptly. Watering needs care as May sun dries beds: water deeply and less often, mulch thickly, and water in the morning so leaves dry by night. Harvesting is generous: asparagus, rhubarb, lettuce, spinach, peas, radishes, spring onions, herbs and the first strawberries. Soil and compost work means mulching heavily once the soil is warm, turning the heap, and adding compost between crops. Houseplants can move outside for the summer in this band, and May is a good month to repot, divide and feed them.
Warm zones 8–10: heat arrives, mulch deep, and sow for summer
In zones 8–10, average last frost dates are already past, roughly from late January in zone 10 to mid-March in zone 8, so May is about heat, not frost. Seed starting indoors is mostly for fall crops now: start fall tomatoes, peppers and brassicas indoors late in May in zones 9–10, and keep sowing herbs such as basil direct.
Direct sowing covers beans, squash, cucumbers, corn, okra, melons, sweet potatoes, carrots, beets and heat-tolerant greens, with lettuce and spinach sown only in shade and harvested young before they bolt. Transplanting continues: set out tomatoes, peppers, eggplant, basil and sweet potato slips, and plant tropical fruit trees and shrubs while the weather is warm. Pruning is light: deadhead flowers, pinch tomatoes, cut back spring-flowering shrubs after they bloom, and shape hedges. Fertilising is regular and light: feed vegetables every few weeks, feed roses and citrus, and side-dress heavy feeders. Pest and disease watch is serious in May: aphids, whiteflies, spider mites, squash vine borers, cucumber beetles and powdery mildew all thrive in warm, humid weather, so check plants weekly and encourage beneficial insects. Watering is now a daily job in the warmest parts of this band: water deeply in the morning, mulch to several inches, and check containers daily. Harvesting is abundant: peas, lettuce, carrots, beets, herbs, strawberries, zucchini, cucumbers and the first tomatoes in zone 10. Soil and compost work means mulching heavily before summer heat peaks, turning the heap, and keeping it moist. Houseplants are outdoors now, and May is a good month to repot, divide, feed and check them for pests.
Frost-free zones 11–13: summer crops, shade and steady watering
Zones 11–13 are frost-free, so May has no frost dates to plan around. The work is managing heat and humidity: shade, mulch and water. Seed starting is direct for most crops, but keep starting tomatoes, peppers and eggplant in trays for an even stand, and sow heat-tolerant greens such as amaranth, Malabar spinach and okra as the weather warms.
Direct sowing covers beans, corn, squash, cucumbers, melons, okra, sweet potatoes, carrots, beets, herbs and tropical vegetables. Transplanting is continuous: set out tomatoes, peppers, eggplant, basil, cucumbers and tropical fruit trees, and plant bananas, papaya and pineapples now. Pruning is shaping and tidying: cut back spent growth, shape fruit trees after harvest, and remove dead wood from tropical shrubs. Fertilising is steady and light: feed vegetables every few weeks, feed citrus and fruit trees, and use compost tea for a gentle boost. Pest and disease watch is weekly and year-round: aphids, whiteflies, spider mites, caterpillars, fungal spots and fruit flies all need attention, and good airflow matters more than spraying. Watering is the biggest May job: water deeply in the morning, mulch heavily, and check containers daily. Harvesting is abundant: tomatoes, peppers, cucumbers, beans, leafy greens, herbs, citrus, bananas and papaya. Soil and compost work never stops: keep the heap hot and turning, add green waste, and refresh beds with compost. Houseplants outdoors need dividing, repotting and a check for pests that spread fast in warm, humid weather.
Staking, mulching and the May checklist
May is the month to get supports in place: stake tomatoes, peas and beans now, while plants are small, and put cages over tomatoes before they sprawl. Mulch beds once the soil has warmed — mulching cold soil in May keeps it cold — and keep mulch away from stems to prevent rot. Also check irrigation, set up watering routines for holidays, and label everything, because by June you will have forgotten which tomato is which.
Frequently asked questions
When can I plant tomatoes outside in May?
In zones 1–4, plant tomatoes out in late May after the average last frost, with fleece handy. In zones 5–7, early to mid-May after the average last frost. In zones 8–10, tomatoes should already be out, and in zones 11–13 they grow year-round. Harden seedlings off for a week first, and check your local extension service for the timing that fits your area.
What should I sow direct in May?
In zones 1–4, peas, lettuce, carrots, beets and beans late in the month. In zones 5–7, beans, squash, cucumbers, corn and melons. In zones 8–10, beans, okra, sweet potatoes and heat-tolerant greens. In zones 11–13, almost everything warm-season, with shade for leafy crops.
How do I stop slugs eating my May transplants?
Protect young plants with copper tape or collars, go out after dark and hand-pick slugs, keep beds clear of debris, and avoid evening watering. Beer traps help, and a mulch of sharp grit around precious seedlings can deter them.
Should I mulch in May?
Yes, once the soil has warmed up. Mulch holds moisture, suppresses weeds and feeds the soil as it breaks down. Keep mulch a few inches away from stems and trunks, and water the soil before mulching, not after.
What can I harvest in May?
In zones 1–4, asparagus, rhubarb, lettuce and radishes. In zones 5–7, asparagus, peas, lettuce, spinach and the first strawberries. In zones 8–10, peas, carrots, zucchini, cucumbers and early tomatoes. In zones 11–13, tomatoes, peppers, beans and herbs all month.