Growing tomatoes in USDA Zone 13 means frost-free and tropical: plant by heat and the wet/dry season, not by frost dates. Tomatoes are the most popular home-grown vegetable, and Zone 13's frost-free climate means they can be grown year-round. The challenge here is not cold but heat: with winter lows above 60°F, fruit sets best in the cooler, drier months, and extreme heat can pause setting altogether. This guide covers when to plant tomatoes in Zone 13, with the soil, spacing, sun, water and care it needs. Use the Zone 13 planting calendar to see what else to sow alongside it.
Zone 13 is the warmest USDA zone, and that warmth is both the opportunity and the problem. There is no winter to kill plants, no frost to plan around, and no reason a tomato plant cannot live for a year or more — but the same heat that keeps plants alive can stop flowers from setting fruit. The trick is to plant for the cooler months for the heaviest crops, use heat-tolerant varieties in the hot season, and keep a simple notebook of what you sowed and when it fruited.
Zone 13 at a glance
USDA Zone 13 has average winter lows of above 60°F and is frost-free year-round — there is no last or first frost date to plan around. Plan by heat and by the wet and dry seasons instead: heat lovers grow year-round, while cool-season crops only succeed in the coolest months. These are zone averages, not promises for any one garden, so check your local extension service for your area.
| Detail | Zone 13 guidance |
|---|---|
| Last / first frost | None — Zone 13 is frost-free year-round |
| Average winter low | above 60°F |
| Days to germination | 7–14 days |
| Days to maturity | 60–85 days |
| Sowing | Start indoors, then transplant as sturdy seedlings |
| Transplanting / planting out | Year-round (frost-free); best results in the planting window above |
| Harvest | Harvest 60–85 days after sowing/transplanting; pick regularly |
| Sun | full sun |
| Soil pH | 6.0–6.8 |
| Spacing | 24–36 inches |
| Water needs | high |
When to plant tomatoes in Zone 13
In Zone 13, tomatoes can be planted at any time of year because there is no frost — average winter lows are above 60°F and the zone is frost-free, so there is no last or first frost date to plan around. The best fruit set comes from plants set out in the cooler months, roughly November to February, when nights are mildest. A hot-season planting is still possible, but choose heat-tolerant varieties, give afternoon shade, and expect setting to pause in the hottest weeks. Tomatoes take 60–85 days to maturity, so work back from when you want fruit. Check your local extension service for the best planting windows in your area. Frost dates are zone averages — check your local extension service before you commit to a date.
Starting tomatoes in Zone 13
Tomatoes are started indoors, then transplanted as sturdy seedlings. Sow in trays or small pots, keep them warm and give them strong light — seeds germinate in 7–14 days — and grow them on until they have several true leaves. Harden off for a week, then transplant deep, burying the stem up to the first true leaves, since tomatoes root along the buried stem. Set a stake or cage in place at planting time, because a tomato plant in Zone 13 can grow large and heavy fast, and staking later risks damaging the roots.
Soil, spacing, sun and water
Tomatoes want full sun and rich, well-drained soil with a pH of 6.0–6.8. Dig in well-rotted compost before planting and space plants 24–36 inches apart, since crowded plants stay small and invite disease. Mulch thickly to keep soil moisture even, which helps prevent blossom-end rot. Tomatoes need high water: water deeply and less often rather than lightly every day, water at the base in the morning so leaves dry before night, and mulch to keep the soil evenly moist. Check the soil a finger's depth down and water when it feels dry there. In Zone 13's heat, consistent watering matters more than total volume. The watering calculator will help you work out a watering routine for thirsty plants.
Companion planting
Good companions for tomatoes include basil, marigolds, carrots, onions, parsley. Basil is the classic tomato companion, said to improve flavour and deter pests, while marigolds draw pollinators and beneficial insects to the bed. The companion planting finder can suggest combinations for your whole bed. Do not plant tomatoes where other members of the nightshade family grew last year, and keep them away from fennel and corn, which compete with them.
Pests and problems
The common pests and problems to watch for with tomatoes are aphids, tomato hornworm, whiteflies, cutworms, blight. Tomato hornworms are the most dramatic pest — big green caterpillars that can strip a plant overnight, so hand-pick them as soon as you see damage. Aphids cluster on shoot tips, whiteflies gather under leaves, and cutworms can sever young stems at soil level. Blight is the main disease in humid weather: water at the base, mulch, space plants for air flow, and remove affected leaves promptly. In Zone 13's year-round warmth, pests never get a winter break, so check plants weekly rather than waiting for damage to show.
Harvest and storage
Tomatoes ripen 60–85 days after transplanting. Pick fruit when fully coloured but still firm, and pick regularly — leaving ripe fruit on the plant slows new fruit. In the heat of the hottest months, fruit set can pause, then resume as temperatures ease, so keep plants watered and fed through the pause rather than pulling them out. Store ripe tomatoes at room temperature, never in the fridge, for the best flavour. Eat within a few days of picking, and cook or freeze any glut — a Zone 13 garden can produce far more than one household can eat fresh.
Making the most of Zone 13
Zone 13's advantage is time: with no frost, you can grow tomatoes in more than one season a year. The trick is to plant for the cooler months for the heaviest crops, use heat-tolerant varieties in the hot season, and keep a simple notebook of what you sowed and when it fruited — after one season you will have a record far more useful than any general guide. Related reading: Bell Peppers in Zone 13 share the same heat-loving habits, and January in Zone 13 is a great month to plant. For how the same crop behaves one zone colder, see Tomatoes in Zone 11.
Frequently asked questions
When should I plant tomatoes in Zone 13?
In Zone 13, tomatoes can be planted at any time of year because there is no frost — average winter lows are above 60°F and the zone is frost-free, so there is no last or first frost date to plan around. Check your local extension service — these are zone averages, not exact dates for your garden.
How long do tomatoes take to grow in Zone 13?
Seeds germinate in 7–14 days, and the crop takes 60–85 days to maturity. In Zone 13, allow the longer end of the range if conditions are hot at sowing time, since extreme heat can pause fruit set.
Can I grow tomatoes all year in Zone 13?
Yes, Zone 13 is frost-free, so tomatoes can be planted year-round, but fruit sets best in the cooler months from roughly November to February, and setting can pause in extreme heat, so plan your main crop for the cooler season.
What soil and spacing do tomatoes need in Zone 13?
Tomatoes need full sun and soil pH 6.0–6.8, spaced 24–36 inches apart. Dig in well-rotted compost, water deeply, mulch, and test your soil through your local extension service.