May in the Garden
May is one of the busiest months in the home garden across much of the United States, though conditions vary widely by region and USDA hardiness zone. In many areas the last spring frost has passed or is close, while colder northern locations may still see chilly nights. Because timing shifts by weeks from one zone to the next, look up your local average last-frost date and confirm current conditions with your regional Cooperative Extension office before you plant.
What to plant in May
Once your local frost risk has passed, May is a common time to transplant warm-season crops such as tomatoes, peppers, squash, cucumbers, and beans, along with many warm-season flowers. In warmer southern regions, gardeners are often well into warm-season planting and may be direct-sowing heat-loving crops like okra, melons, and sweet potatoes. In cooler northern regions, wait until nights stay reliably mild, and consider starting with cool-season crops such as lettuce, peas, and root vegetables while holding tender plants until the frost date is safely behind you. Harden off seedlings by gradually exposing them to outdoor conditions over several days, and let your own frost date guide the schedule.
Garden tasks for May
May tasks center on getting beds ready and keeping new plantings comfortable. Work compost or organic matter into planting areas, prepare seedbeds, and add a layer of mulch to help hold soil moisture and slow weed growth. Set up stakes, cages, or trellises early so vining and tall crops have support before they need it, and keep up with weeding while plants are small. Finish spring pruning of shrubs that have already flowered, water new transplants as they establish, and keep notes on planting dates so you can plan future seasons.
Colder regions (zones 3-6)
In colder northern zones (roughly 3 through 6), late-spring frost can still be a real possibility in early and mid May, so watch the forecast and keep row covers or other protection on hand for tender plants. Many gardeners here focus first on cool-season crops and delay setting out heat-loving transplants until nights warm and the local frost date has passed. Confirm your specific timing with your Cooperative Extension office, since higher elevations and northern locations can run well behind the calendar.
Warmer regions (zones 8-10)
In warmer southern zones (roughly 8 through 10), May is often a peak warm-season month, and gardeners may already be harvesting early crops while planting heat-tolerant vegetables and flowers. Rising temperatures make mulching and consistent watering especially helpful for keeping soil moisture steady as the season heats up. Some cool-season crops may be winding down now, so plan to transition beds toward summer plantings and check with your local Extension office for region-specific timing.
Not sure of your timing? Look up your local frost dates and planting calendar by ZIP.
Timing depends on your local frost dates and USDA hardiness zone; confirm with your local Cooperative Extension office. Page updated Aug 4, 2026.