USDA Zone 8 planting calendar
When to plant tomatoes in USDA zone 8
Sowing, transplant, and harvest dates calibrated to zone 8's 230-day season (Texas (much of), Louisiana, North Florida, Oregon coast, Washington (parts)).
Key dates for tomatoes in zone 8
| Stage | When | Anchor |
|---|---|---|
| Indoor seed start | mid-February (February 11) | 6 weeks before last frost |
| Outdoor transplant | early April (April 4) | 10 days after last frost (mid- to late March) |
| First harvest (estimate) | mid-June (June 18) | ~75 days from transplant |
Dates are zone-wide averages. Local microclimates (south-facing slopes, urban heat, lakeside warmth, elevation) can shift the planting window by 1-2 weeks within the same zone.
Why this timing works for zone 8
Zone 8 has average annual minimum temperatures of 10 to 20°F and a 230-day frost-free window from mid- to late March to mid-November. Tomatoes are tender — they need soil above 16 °C to grow and stop fruiting once nights drop below 10 °C. That puts the safe outdoor planting window after the last spring frost passes, and the harvest closes when fall temperatures arrive.
Wait until soil has warmed to at least 16 °C and night temperatures stay above 10 °C. Tomatoes set fruit poorly below 13 °C at night and stop above 32 °C, which is why hot-zone gardeners run a spring + fall crop instead of one long summer.
Quick-grow guide
- Sun: Full sun — 6+ hours direct.
- Soil temperature for germination: 21-27 °C (70-80 °F).
- Spacing: 24-36 inches (60-90 cm) between plants.
- Days to harvest from transplant: ~75 days.
- Wait until night temperatures stay above 10 °C — cold soil stunts warm-season crops permanently.
Common mistakes — zone 8 × tomatoes
- Planting before last frost: zone 8's last frost averages mid- to late March, and even a light frost will kill tomatoes seedlings overnight.
- Skipping hardening off: even healthy indoor transplants need 7-10 days of progressive outdoor exposure before going in the ground.
Source and methodology
Frost-date averages from NOAA Climate Data Online within each USDA hardiness zone. Hardiness zone boundaries from the USDA Plant Hardiness Zone Map (2023). Crop timing offsets calibrated against US Cooperative Extension Service publications (UNL, UMN, NC State, Texas A&M, UF/IFAS) and cross-checked against the RHS sowing calendar for en-GB readers. Curated by the Growli editorial team.
Keep going
- How to grow tomatoes — full guide
- USDA Zone 8 — frost dates and what else to plant
- All 13 USDA hardiness zones
Same crop, nearby zones
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