When to Plant Tomatoes: 9 Simple Tips for a Great Harvest

Why When to Plant Tomatoes Depends on Your Zone

Tomatoes are warm-season plants that get damaged or killed by frost, so timing is everything. Check your USDA hardiness zone and your local last frost date before planting — most tomatoes should go in the ground 2-3 weeks after that date, once soil has warmed.

Tomato Planting Guide by US Zone

• Zones 3-4: Late May to early June
• Zones 5-6: Mid-to-late May
• Zone 7: Late April to early May
• Zones 8-9: Mid-to-late March
• Zones 10-11: February through March, avoiding peak summer heat

These are general windows — always check your local extension office for exact dates in your area.

Signs It’s Time to Plant Tomatoes

Beyond your zone, watch for these signs: soil temperature has reached at least 60°F, nighttime lows stay consistently above 50°F, and your seedlings have been properly hardened off (gradually acclimated to outdoor conditions over 7-10 days). Many university extension programs publish exact soil temperature guides if you want more precision.

Final Thoughts

Knowing when to plant tomatoes comes down to your zone, your last frost date, and a little patience — rushing this step is one of the most common beginner mistakes. Get the timing right, and the rest of the season gets a lot easier.

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Have a question about your specific zone or frost date? Contact us — we’re happy to help point you in the right direction.