What to plant in April in USDA zone 9

Sow outdoors in April — zone 9

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 tomatoes, peppers, okra, southern peas
• Eggplant, sweet potatoes, melons

Harvest in April — zone 9

These crops should be ready or in active harvest in April for zone 9 gardens. Pick fruiting crops every 2-3 days to keep production going.

• Strawberries, citrus, spring greens

Maintenance in April — zone 9

• Shade cloth and irrigation prep for May heat

Universal April tasks

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

• Harden off transplants before moving them outdoors — 7-10 days.
• Direct-sow carrots, beets, lettuce, peas, and brassicas.
• Start cucumbers, squash, melons, and basil indoors (zones 3-5).
• Plant asparagus, rhubarb, strawberries, and bare-root fruit trees.
• Set up trellises, tomato cages, and row cover hoops.
• Mulch perennial beds once soil has warmed to 10 °C.

Why this works for zone 9

Zone 9 has average annual minimum temperatures of 20 to 30°F (-7 to -1°C) and a frost-free window from mid-February to early March to late November / early December — about 280 growing days. Heat-tolerant tomato varieties (Solar Fire, Heatwave II) needed for midsummer. Cool-season crops grow Oct-Apr while northern zones are dormant.

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 — April

April is the UK's main sowing month. Direct-sow carrots, beetroot, lettuce, peas, salad leaves, radishes, spring onions. Plant maincrop potatoes. Sow runner and French beans indoors. Last frost passes in much of the south by month's end — H5 gardens can risk tender transplants under fleece.

Source and methodology

Frost-date averages from NOAA Climate Data Online within USDA zone 9. 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

• ← March in zone 9
• May in zone 9 →
• All zones — what to plant in April
• USDA Zone 9 — frost dates and crop list
• Full 12-month planting calendar

Other zones — April

• What to plant in April in zone 3
• What to plant in April in zone 4
• What to plant in April in zone 5
• What to plant in April in zone 6
• What to plant in April in zone 7
• What to plant in April in zone 8
• What to plant in April in zone 10