Plant tomato seedlings outdoors after your area’s frost danger has passed and the soil has warmed—not simply on a fixed calendar date. Extension guidance ranges from about 60°F soil temperature to 65°F, depending on the source; local conditions and advice should determine your timing.
How to tell when it is safe to plant tomatoes
Tomatoes are warm-season plants, and frost can kill them. Before transplanting, check both your local frost outlook and soil temperature. The University of New Hampshire Cooperative Extension recommends soil around 60°F; University of Connecticut Extension recommends 65°F soil and daytime air averages of 55°F to 60°F. These are source-specific recommendations rather than one universal threshold.
A reported average last-frost date is a planning guide, not a guarantee that a particular garden is ready. Elevation, nearby water, exposure, and cold pockets can affect local conditions. If the soil is still cool or the forecast points to frost, waiting is safer than relying on the date alone.
Why planting into a cold spring can set plants back
Planting early does not necessarily mean harvesting early. Illinois Extension notes that cold nights can stall tomato growth and that a plant may take up to two weeks to resume normal growth after cold stress. A short delay while conditions improve can be better than leaving seedlings exposed to cold.
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- Beautiful - Variety Pack: Five large individual packets of family favorite tomato varieties: Cherokee Purple, Beefsteak, Large Red Cherry, Marglobe, and Roma. Enjoy these classic, productive tomatoes in your garden this season.
- Great Variety - Heirloom tomatoes come in such a wide range of shapes including cherry, beefsteak, grape, paste, roma; and in many more colors than red, including yellow, purple, and black.
- Good Eats - Home-grown heirloom tomatoes have so much more flavor than supermarket hybrid varieties. They are divine simply sliced and sprinkled with a little salt and pepper, but don’t stop there! Mix with fresh mozzarella and basil for a summertime salad or bruschetta, make fresh pico, a tomato tart, smoky and spicy tomato jam, or preserve them (dried or canned) for a shot of garden flavor in deep winter.
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Regional dates are useful examples, not a national schedule
Extension calendars show how much timing varies even within a region. Use the examples below to understand the range, then follow local frost and soil conditions rather than applying another state’s dates to your garden.
| Location | Local planting guidance | How to use it |
|---|---|---|
| New Hampshire | Much of the state can plant around Memorial Day weekend; southern areas may plant one or two weeks earlier, while northern frost pockets may need to wait until mid-June. | Follow local conditions, especially in colder or elevated areas. UNH Cooperative Extension |
| Connecticut | Average last frost is in mid- to late May, with considerable variation by location and season. | Use the average as context, not as a promise that frost risk has ended. UConn Extension |
| Indiana | Mid-to-late April in southern Indiana and mid-to-late May in northern Indiana, after frost risk passes and soil warms. | The wide spread illustrates why a statewide date can mislead. Purdue Extension |
| Iowa | Early to mid-May is typical; June 20 is the last practical planting date there for good yields. | This is Iowa-specific guidance, not a deadline for other climates. Iowa State University Extension and Outreach |
Plan seedlings backward from your outdoor planting date
Once you have a likely transplant window, count backward to plan indoor seed-starting. UNH Cooperative Extension recommends starting seeds indoors six to eight weeks before the intended transplant date. Starting much earlier can leave plants waiting indoors longer than planned.
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- Classic Beefsteak Flavor: Beef steak tomato seeds grow mild, juicy, meaty fruits perfect for slicing tomato use. Large tomato seeds develop firm flesh ideal for sandwiches, salads, burgers, and fresh eating from your vegetable garden.
- Easy Garden Care: Tomato plant seeds thrive in well-draining sandy loam soil. Space beefsteak tomatoes plants 18–24 inches apart, stake or cage vines, and maintain consistent watering for best growth for heirloom seeds.
- Giant Fruit Size: Beefsteak tomato plant seeds produce massive red slicing tomatoes. Indeterminate tomato seeds ideal veggie seeds for garden plots, raised beds, and greenhouses.
- Fast Germination: Tomato seeds for planting germinate in 7–10 days when planted 1/4 inch deep. These non gmo tomato seeds perform best in full sun across USDA zones 2–11.
- Big Fruit Size: These tomato plant seeds produce large red tomatoes, and are suitable seeds for garden plots, raised beds, and greenhouses.
- Estimate the transplant window. Use local frost guidance, then adjust for the soil and forecast.
- Start seeds indoors six to eight weeks ahead. This interval is UNH Cooperative Extension’s recommendation for its fact sheet guidance.
- Harden seedlings gradually for about ten days. Increase their exposure to outdoor conditions over time rather than moving indoor-grown plants straight into the garden.
- Choose sturdy plants for transplanting. UNH advises selecting stocky seedlings with sturdy stems and no visible insect or disease damage. Avoid tall, lanky seedlings and plants already flowering or fruiting. Cell packs or individual containers can reduce root disturbance compared with flats.
Choose a tomato variety that fits your season and harvest plans
Varieties differ in maturity time, growth habit, disease resistance, fruit type, and intended use. UNH notes that some tomatoes ripen in 55 days while others need three months of hot weather. Compare the stated maturity time with the time available between transplanting and your area’s first expected fall frost; a variety’s maturity estimate is not a guarantee of harvest under every garden’s conditions.
Match growth habit to the harvest you want
- Determinate varieties set fruit over a shorter period, which can suit gardeners who want a more concentrated harvest. Paste tomatoes often set a large load over a shorter time.
- Indeterminate varieties continue flowering and setting fruit through the season. They need support such as staking or caging; UNH also notes they can be pruned.
For a short growing season, consider early-maturing cultivars and varieties tested or recommended locally. When comparing options, consider disease resistance, available space, fruit use, and whether you want a concentrated crop or fruit over a longer stretch. UConn and UNH extension resources offer variety guidance for their regions.
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- Beautiful - Large full-color packets of Beefsteak Tomato (Solanum lycopersicum) seed. Heirloom variety with a wide shape that can grow to 6” in diameter. Wonderful meaty slicing tomato that may hang over the sides of your toast. Has a classic red-tomato flavor. Indeterminate vines need support and will produce until the first frost. Seed packet contains 100mg (about 45 seeds).
- Productive - Tomatoes germinate in 5-10 days when soil temps are 70-80°F. Plant 1/4” deep and space 36” apart in an area with full sun. This variety will grow up to 6’ tall with a spread of 3-4’. Fruits will mature in 75-85 days, plant in USDA zones 2-11.
- Good Eats - You can eat these slicer tomatoes plain with some salt and pepper, or add it to your morning toast. Use in recipes such as bruschetta, pico, tomato tarts, jam, or try your hand at storing your garden tomatoes for a long-lasting harvest. Beefsteak tomatoes are versatile, juicy, and savory.
- Easy to Grow - Instructions included on each packet. Plus, we are available to answer all your questions. If these seeds don’t germinate, we will happily make it right for you.
- Safe and Sustainable - Our operation is fully solar powered, and Sow Right Seeds has taken the Safe Seed Pledge to sell only fresh Non-GMO heirloom seeds for you and your family.
Give plants the conditions that support fruit production
Pick a sunny, well-drained site
UNH Cooperative Extension gives a soil pH range of 6.2 to 6.8 for tomatoes. A soil test is a better basis for lime and fertilizer decisions than applying a generic schedule. Excess nitrogen can encourage vigorous foliage at the expense of fruit.
Support plants according to their growth habit
Use an appropriately sized cage or stake for the mature variety, especially for indeterminate plants. Purdue Extension explains that trained plants have better air circulation and keep fruit off the soil. It also notes that caged tomatoes can be more productive because suckers do not need to be removed. These are advantages of support, not a guarantee that every cage or training method will increase a crop.
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- Name: Roma VF Tomato | Type: Heirloom
- Size at Maturity: 6 oz | Days to Maturity: 90 Days | Light Requirement: Full Sun
- Planting Time: Warm Season | Sowing Method: Start Indoors
- Planting Depth: 1/2" | Plant Spacing: 18"
Keep moisture steady as fruit develops
Iowa State University Extension and Outreach offers about one inch of water per week as a general guide, with adjustments for rainfall and soil. Uneven moisture can contribute to fruit cracking and blossom-end rot. Mulch can help conserve moisture, suppress weeds, and moderate soil conditions.
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- USDA Certified Organic by Oregon Tilth
- 10 varieties of tomato (Solanum lycopersicum) seeds packed fresh for the current and following year
- Cherokee Purple, San Marzano, Yellow Pear, Chocolate Cherry, Green Zebra, Black Krim, Brandywine Pink, Virginia Sweets, Rosso Sicilian, and Amana Orange
- 100%: non-GMO, open pollinated, trusted varieties
- Easy tomato grow guide included, with tips printed on the back of each packets too
Sources for local tomato guidance
- University of New Hampshire Cooperative Extension: Growing Vegetables—Tomatoes
- Purdue Extension: HO-26, Tomatoes
- Iowa State University Extension and Outreach: Growing Tomatoes in the Home Garden
- University of Illinois Extension: Tomato
- University of Connecticut Extension: Tomatoes
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