What Can You Plant in May in Cleveland?

May is an exciting time for Cleveland gardeners! The risk of frost is fading, and the soil is warming up, making it one of the best months for planting. Whether you’re growing vegetables, herbs, or flowers, May is prime time to get plants in the ground for a strong start to the season. This guide will walk you through the best planting choices for Northeast Ohio in May.

Understanding Cleveland’s May Climate

Cleveland, located in USDA Hardiness Zone 6a, experiences mild to warm temperatures in May, ranging from the 50s to the 70s. By mid-to-late May, the danger of frost is usually past, allowing both warm-season and cool-season crops to thrive. May is the ideal transition month for planting a wide range of crops.

Vegetables You Can Plant in May

Cool-Season Crops

Early May is still great for cool-season crops that can handle chilly nights:

• Lettuce & Spinach – These leafy greens thrive in cool weather but can still be planted in shady areas later in the month.
• Kale & Swiss Chard – Hardy greens that tolerate cool nights and last into the heat of summer.
• Carrots & Beets – These root vegetables prefer cool soil and can be sown throughout the month.
• Radishes & Turnips – Fast-growing and perfect for quick harvests before summer heat sets in.
• Peas – Plant in early May for a final cool-season crop before summer heat takes over.

Warm-Season Vegetables

Once the risk of frost has passed (typically after May 15th), it’s time to plant warm-season crops:

• Tomatoes – Start with transplants for a head start on the season. Choose disease-resistant varieties for best results.
• Peppers – Both sweet and hot pepper plants thrive in warm soil and sunny conditions.
• Cucumbers – Fast-growing and perfect for summer harvesting. Plant seeds directly in the garden after the last frost.
• Squash & Zucchini – These produce quickly and thrive in warm soil.
• Corn – Needs warm soil to germinate properly. Plant in blocks for better pollination.
• Beans – Both bush and pole beans can be planted in May and will produce through summer.
• Eggplant – Requires warm soil, so plant transplants rather than seeds.

Herbs to Plant in May

Herbs thrive in May’s moderate temperatures, making it a great time to plant both annual and perennial varieties:

• Basil – Prefers warm weather and should be planted after the last frost.
• Cilantro – Grows best in cooler weather; plant early in May for better results.
• Dill – Easy to grow and attracts beneficial insects to the garden.
• Parsley – Hardy and can be planted early in the month.
• Oregano & Thyme – Perennial herbs that establish well in spring.
• Chives – A great perennial herb that returns each year.

Flowers to Plant in May

May is the perfect time to add color to your garden with both annuals and perennials:

• Petunias – A classic choice for long-lasting color.
• Marigolds – Great for pest control and vibrant summer blooms.
• Zinnias – Fast-growing and long-blooming for a summer show.
• Sunflowers – Can be planted in late May for blooms by mid-summer.
• Coneflowers (Echinacea) – A hardy perennial that attracts pollinators.
• Black-Eyed Susans – Another pollinator-friendly perennial that thrives in Ohio.

Tips for Gardening in May

1. Check Soil Temperature – Warm-season crops need soil temperatures above 55°F for best germination.
2. Harden Off Transplants – If starting plants indoors, gradually expose them to outdoor conditions before planting.
3. Mulch to Retain Moisture – Helps keep roots cool and conserves water.
4. Watch for Late Frosts – Be ready to cover tender plants if temperatures drop unexpectedly.
5. Space Plants Properly – Overcrowding leads to disease and stunted growth, so follow spacing recommendations.

Colin’s Key Points

• May is the perfect planting month in Cleveland for both cool- and warm-season crops.
• Early May is great for leafy greens and root vegetables, while late May is ideal for tomatoes, peppers, and squash.
• Herbs like basil, dill, and thyme thrive in May’s moderate temperatures.
• Add color to your garden with zinnias, marigolds, and sunflowers.
• Be mindful of frost early in the month and protect tender plants when necessary.