March · USDA Zone 8
springWhat to plant in March in USDA zone 8
Spring planting guide for zone 8 (Texas (much of), Louisiana, North Florida, Oregon coast, Washington (parts)) — a 230-day growing season with last frost around mid- to late March and first frost around mid-November.
Sow outdoors in March — 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.
- Beans, corn, cucumbers, squash, melons
- Final cool-season succession (lettuce, spinach, radishes)
Transplant in March — zone 8
Move hardened-off seedlings into the garden. Tender crops want soil above 16 °C and night temperatures consistently above 10 °C; cool-season transplants tolerate light frost.
Harvest in March — zone 8
These crops should be ready or in active harvest in March for zone 8 gardens. Pick fruiting crops every 2-3 days to keep production going.
- Spring brassicas, peas, strawberries
Universal March tasks
These apply across most US and UK gardens in March, regardless of zone.
- Start tomato, pepper, and eggplant seeds indoors (if not already).
- Direct-sow peas, spinach, lettuce, radishes once soil is workable.
- Transplant onions and leeks outdoors in zones 5-9.
- Plant bare-root fruit trees, berries, and asparagus crowns.
- Prune roses just before they break dormancy.
- Top-dress beds with compost and start hardening off transplants.
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 — March
March opens outdoor sowing for most of the UK. Direct-sow peas, broad beans, spinach, radishes, and early carrots under cloches. Indoor: tomatoes, peppers, aubergines, cucumbers. Plant first early potatoes mid-month.
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
- ← February in zone 8
- April in zone 8 →
- All zones — what to plant in March
- USDA Zone 8 — frost dates and crop list
- Full 12-month planting calendar