What to plant in May in USDA zone 8

Sow outdoors in May — zone 8

Direct-sow these seeds into prepared garden beds or large containers. Soil temperature matters more than the calendar date — wait for a sustained warm-up before sowing tender crops.

• Heat-tolerant beans (yard-long, southern peas), okra, melons
• Sweet potato slips

Harvest in May — zone 8

These crops should be ready or in active harvest in May for zone 8 gardens. Pick fruiting crops every 2-3 days to keep production going.

• Tomatoes (early), peppers, squash, peas, strawberries, onions

Maintenance in May — zone 8

• Shade cloth for tomatoes once temps top 32 °C

Universal May tasks

These apply across most US and UK gardens in May, regardless of zone.

• Plant warm-season crops after last frost — tomatoes, peppers, beans, cucumbers, squash.
• Mulch beds heavily once soil has warmed to retain moisture.
• Stake or cage tomato plants before they sprawl.
• Direct-sow corn, beans, cucumbers, squash, and melons once soil hits 16 °C.
• Begin succession sowing of bush beans every 2-3 weeks.
• Pinch herbs to encourage bushy growth.

Why this works for zone 8

Zone 8 has average annual minimum temperatures of 10 to 20°F (-12 to -7°C) and a frost-free window from mid- to late March to mid-November — about 230 growing days. Summer heat can shut down tomato production July-August. Many zone 8 gardeners do spring + fall tomato crops with a midsummer break.

Dates are zone-wide averages. Local microclimates (south-facing slopes, urban heat, lakeside warmth, elevation) can shift the window by 1-2 weeks within the same zone.

UK gardeners — May

May is the UK's tender-crop month. Plant out tomatoes, peppers, courgettes, runner beans, and sweetcorn after the last frost (typically mid- to late May). Direct-sow French beans, courgettes, sweetcorn, and squashes. Harvest asparagus, rhubarb, and first lettuce.

Source and methodology

Frost-date averages from NOAA Climate Data Online within USDA zone 8. Hardiness boundaries from the USDA Plant Hardiness Zone Map (2023). Crop timing curated against US Cooperative Extension Service publications (UNL, UMN, NC State, Texas A&M, UF/IFAS, Oregon State) and cross-referenced against the RHS sowing calendar. Curated by the Growli editorial team.

Keep going

• ← April in zone 8
• June in zone 8 →
• All zones — what to plant in May
• USDA Zone 8 — frost dates and crop list
• Full 12-month planting calendar

Other zones — May

• What to plant in May in zone 3
• What to plant in May in zone 4
• What to plant in May in zone 5
• What to plant in May in zone 6
• What to plant in May in zone 7
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• What to plant in May in zone 10