May is one of the most exciting months for gardeners in Zone 5. The soil is warming, the risk of frost is fading, and it is finally time to roll up your sleeves and get planting. But with so much to do, it helps to have a clear plan. Here is your week-by-week guide to what to prioritize in your May garden.
Early May (May 1 to 15): Watch for Frost and Prep Beds
- Monitor your average last frost date. In Zone 5, this typically occurs in mid-May but can vary by location.
- Harden off seedlings by gradually introducing indoor-grown plants to outdoor conditions.
- Prepare your garden beds by removing weeds, adding compost, and amending soil.
- Build or refresh raised beds and check irrigation systems for any needed repairs.
- Direct-sow cold-tolerant vegetables such as:
- Peas
- Lettuce
- Radishes
- Carrots
- Spinach
- Beets
Mid-May (May 15 to 22): Start Planting Warm-Season Crops
- Plant potatoes if you have not already.
- Transplant hardy annuals like:
- Marigolds
- Snapdragons
- Pansies
- Begin planting tender vegetables such as:
- Tomatoes
- Peppers
- Cucumbers
- Squash
- Melons
- Use row covers or plant protectors if nighttime temperatures are still cool.
- Apply mulch to retain soil moisture and suppress weeds.
Late May (May 23 to 31): Full Speed Ahead
- Plant heat-loving crops including:
- Beans
- Corn
- Zucchini
- Eggplant
- Stake or cage tomatoes to support growth and avoid root disruption later.
- Fertilize established perennials and shrubs that are actively growing.
- Start planting herbs such as:
- Basil
- Cilantro
- Dill
- Parsley
- Thyme
- Chives
Additional Tasks for the May Garden
- Divide and transplant perennials like daylilies, hostas, and iris.
- Deadhead spring bulbs, but allow the foliage to die back naturally to nourish next year’s blooms.
- Monitor for pests such as aphids, flea beetles, and slugs.
- Set up supports for climbing plants including peas, beans, and flowering vines.
A Practical Tip
- Keep a garden journal to track frost dates, planting times, and lessons learned. This small habit can greatly improve your success year after year.