For Virginia Beach, onions and leeks go into flats from December 5 to December 26, and cabbage-family crops and head lettuce from January 2 to January 23. Peppers and eggplant start January 16 to January 30, and tomatoes February 6 to February 27. Those windows count back from a last spring frost of March 20 to April 3. Inland and in the mountains the last frost comes later, so every window slides later with it.
The date everything counts back from
Every indoor sowing date starts with one number: the last spring frost. NOAA’s 1991-2020 Climate Normals for the NAS Oceana station in Virginia Beach put it between March 20 and April 3. That range comes from the 32°F freeze probabilities, in the band where the chance of another freeze falls between 30 and 70 percent. Counting backward from it tells you when seeds go into trays.
The range exists because no two springs match. A warm March can end the freezes before March 20, and a cold April can still deliver one after April 3. Sow for the early end and seedlings reach transplant size too soon. They sit in their pots, stretch, crowd their roots, and wait for weather that has not arrived. Sow for the late end and you lose weeks, because the transplants reach the garden later than they needed to. Tomatoes, peppers and eggplant planted out late have less spring to settle in before summer heat arrives.
The decision to write down is simple. Choose a working last-frost date somewhere between March 20 and April 3, then count back from it. A date in the middle of the range is a sensible first guess. After a season or two, nudge it earlier or later based on what your own yard does. Low spots that collect cold air tend to freeze later in spring than a sunny slope or a spot beside a south-facing wall.
Virginia Beach is the mild end of the state. The Blue Ridge and southwest Virginia run weeks later in spring and earlier in fall, so a gardener there pushes every sowing date later by the same margin. The First and Last Frost Dates in Virginia breakdown helps you find where your county falls.
Hardiness zones are a different measurement. The USDA Plant Hardiness Zone Map 2023, built on 1991-2020 normals, runs from 5b to 8b across Virginia. A zone rests on a single variable, the average annual extreme minimum temperature. It tells you which perennials survive winter, not when to start tomatoes. Use the zone for shrubs and fruit trees, and use the frost range for seed trays. More regional detail sits in the Virginia guides.
The weeks-before figures in the next section come from University of Minnesota Extension. Its table lists how many weeks each crop spends indoors before planting out. The calendar months in that table belong to Minnesota, so the windows here are counted fresh from the Virginia frost range.
The calendar, crop by crop
The weeks below are the usual extension guidance for how long a seedling spends indoors before it goes outside. They are not a law, and a few days either way will not hurt a healthy seedling. The windows show where those weeks land when counted back from a March 20 to April 3 last frost at Virginia Beach.
| Crop | Weeks indoors before planting out | Indoor sowing window (Virginia Beach) |
|---|---|---|
| Leeks, onions | 14-15 weeks | December 5 to December 26 |
| Celery | 12-13 weeks | December 19 to January 9 |
| Broccoli, Brussels sprouts, cabbage, cauliflower, head lettuce | 10-11 weeks | January 2 to January 23 |
| Eggplant, okra, peppers | 9 weeks | January 16 to January 30 |
| Tomatoes | 5-6 weeks | February 6 to February 27 |
| Sweet potatoes (for slips) | 3-4 weeks | February 20 to March 13 |
The order of the table matters more than any single date. Onions and leeks come first, in the dead of winter, because they grow slowly from fine seed and need the longest head start. Peppers, eggplant and okra come next. They are slow, heat-loving crops, and a late start shows up as small plants and a late harvest. Tomatoes go in February 6 to February 27, close to the end of the line, because they grow fast. A tomato started in December would be a tall, tangled plant long before the garden is ready for it. The Growing Tomato Seedlings Indoors guide covers potting up and spacing.
Head lettuce sits with the cabbage family at 10 to 11 weeks. Loose-leaf lettuce is usually sown straight into the ground, and the Starting Lettuce page covers both routes.
Which crops should not be started indoors in Virginia?
Root crops such as carrots, beets, radishes and parsnips resent being moved. Their taproots can fork or stunt when disturbed, so they go in the ground where they will grow. Beans also do better sown outdoors in warm soil, and they germinate quickly enough that an indoor start gains little. Squash is usually sown outdoors too. Seedlings started in pots outgrow them fast and sulk when the roots are disturbed. A few gardeners start squash in deep, biodegradable pots to get a small head start, but in most Virginia gardens direct sowing after the soil warms is simpler and works well.
How do the dates shift in the Blue Ridge and southwest Virginia?
Every window in the table moves later there, because the last frost comes later. A gardener at higher elevation counts the same number of weeks back from a later frost date and arrives at a later sowing date. A milder spot near the coast can sow at the early end of each window. When you know your own local range, the Virginia Planting Calendar shows what goes into the ground and when.
Light, warmth and hardening off
Seed trays reward the right conditions more than they reward good intentions. Three things matter: light, steady warmth, and a gradual move outdoors.
Why do seedlings get leggy on a windowsill?
Winter sun is low, short and weak, and a window delivers it from one side. Seedlings stretch toward it, producing long, pale, floppy stems with small leaves. That leggy growth is the plant reaching for light it is not getting, and it does not reverse once it has happened. Window light can work for a few sturdy crops in a bright south-facing room, but for peppers, onions and anything started in December or January it rarely does.
A plain shop light or grow light hung just above the seedlings does the job. Keep it close to the tops of the plants and raise it as they grow. Run it on a timer for long days, similar to early summer, and give the plants a dark night. Rotating a tray that gets any window light keeps stems from leaning.
What warmth do seeds need to germinate?
Germination wants steady warmth, not a warm afternoon followed by a cold night. Peppers, eggplant and okra are among the most demanding. A tray left on a cool basement floor in January can sit for weeks without sprouting, and cold, wet mix invites rot. A warm spot such as the top of a refrigerator or a waterproof seedling heat mat under the tray evens out the swings. Once seedlings are up, a slightly cooler room tends to give stockier plants, as long as they have good light.
How do you harden off seedlings before planting out?
Extension guidance is to harden off every plant over the last 1 to 2 weeks before it goes into the garden. Start with an hour or two in a sheltered spot out of direct wind and midday sun, then lengthen the time each day. By the end of the period the trays stay out through the day, and eventually overnight if nights are mild. Bring them in if a cold night is forecast.
Skipping this step is a common way healthy indoor plants fail. Leaves that grew under lamps or a window scorch in direct sun, and soft stems whip around in wind. A week or two of gradual exposure thickens the tissue so the plant takes the change in stride.
What goes wrong
Many problems with indoor seed starting trace back to three habits: starting too early, keeping the mix too wet, and planting out the moment the average last frost date arrives.
Starting too early produces tall, stringy plants with roots circling the cell. Peppers and tomatoes may even flower in the tray, which stunts the plant. Pot up into a larger container to buy a little time, but the better fix is to count back from the real date next year. If a seedling is outgrowing its cell, the weeks in the table were probably counted from too early a frost date.
Damping off shows up as seedlings that were fine yesterday and lie collapsed today, with a thin, pinched, water-soaked stem at the soil line. It is caused by soil-borne fungi and water molds that thrive in cool, wet, stagnant conditions. Prevention is practical: clean trays, fresh seed-starting mix rather than garden soil, water from below, and some air movement from a small fan. Thin overcrowded cells. Let the surface dry slightly between waterings.
The third mistake happens outdoors. The last spring frost falls in a range, so a transplant set out the week after a date in the range has no guarantee of safety; check with your local extension office for your area. Even without a freeze, cold soil stops tender plants cold. Leaves turn purplish, growth stalls, and a plant set out in warm weather soon passes it. Hold tomatoes, peppers, eggplant, okra and sweet potatoes until the March 20 to April 3 window has passed and nights have settled, and watch the extended forecast. A row cover or an upturned bucket on a doubtful night gives you a cheap margin.
Common questions
When should I start tomato seeds indoors in Virginia?
For Virginia Beach, sow tomatoes indoors from February 6 to February 27, which is 5 to 6 weeks before planting out. Gardeners in the Blue Ridge and southwest Virginia start later, because their last frost comes later. A tomato started too early becomes tall and root-bound long before the garden is ready.
Can I use the same dates anywhere in Virginia?
No. The windows above come from the Virginia Beach frost range of March 20 to April 3, which is the mild end of the state. Higher and more northern places sow later, and milder coastal spots can sow at the early end. Find your local last frost, then count back using the weeks in the table.
Which vegetables are better sown directly in the garden?
Root crops, beans and, in most cases, squash do best sown where they will grow. They resist transplanting and germinate readily in warm soil. Leaf lettuce is also commonly direct-sown, though head lettuce takes 10 to 11 weeks indoors.
How long should seedlings stay indoors?
It depends on the crop: 14 to 15 weeks for leeks and onions, 12 to 13 for celery, 10 to 11 for the cabbage family and head lettuce, 9 for peppers, eggplant and okra, 5 to 6 for tomatoes, and 3 to 4 for sweet potatoes. Hardening off takes place over the last 1 to 2 weeks of that time. If a plant outgrows its cell before planting-out time, moving it to a larger pot holds it until the weather cooperates.
Sources: ncei.noaa.gov | extension.umn.edu