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How Long Do Tomato Seeds Take to Germinate?

Tomatoes are one of the most popular crops grown by UK gardeners, whether on a windowsill, in a greenhouse or under cover outdoors. One of the most common questions at sowing time is how long tomato seeds take to germinate and what conditions are needed for reliable results.

In most cases, tomato seeds germinate in 5 to 10 days. Under ideal conditions, some varieties can sprout in as little as 4–5 days, making tomatoes quicker and easier to start than crops such as peppers or aubergines.

Typical Tomato Seed Germination Times

Conditions Expected Germination Time
Ideal warmth (20–25°C) 5–7 days
Cooler conditions (15–18°C) 7–14 days
Below 15°C Slow or uneven germination

Best Temperature for Germinating Tomato Seeds

Tomato seeds germinate best at a compost temperature of 20–25°C.

In the UK, this is usually achieved by sowing from March onwards on a warm windowsill, using a heated propagator for earlier sowings, or keeping trays in a consistently warm indoor space.

Tomatoes will still germinate at slightly lower temperatures, but germination will take longer and may be uneven.

Compost and Moisture Requirements

For best results, use a fine seed compost rather than multi-purpose compost. Tomato seeds require consistent moisture during germination but are prone to rotting if compost becomes waterlogged.

  • Keep compost moist, not wet
  • Avoid cold, saturated compost
  • Maintain even moisture until seedlings emerge

How Deep to Sow Tomato Seeds

Tomato seeds should be sown around 5–10 mm deep. Lightly cover with compost or vermiculite and gently firm to ensure good contact with the compost.

Clear labelling is essential when sowing multiple tomato varieties, as young seedlings look very similar.

Do Tomato Seeds Need Light to Germinate?

Tomato seeds do not need light to germinate. They will sprout in darkness provided warmth and moisture are correct.

Once seedlings emerge, they should be moved into bright light immediately to prevent tall, weak growth.

Tomato Types, Varieties & Germination Speed

Different tomato types germinate at slightly different speeds, although most fall within a similar range. Below is a guide using tomato varieties sold by GrowSeed.

Typical Tomato Seed Germination Times

Conditions Expected Germination Time
Ideal warmth (20–25°C) 5–7 days
Cooler conditions (15–18°C) 7–14 days
Below 15°C Slow or uneven germination

Tomato Types, Varieties & Germination Speed

Tomato Variety Type Typical Germination Speed Notes
Gardener’s Delight Cherry 5–7 days Classic cherry; prolific and reliable
Black Opal Cherry 5–7 days Dark-skinned cherry with rich flavour
Sweet Aperitif Cherry 5–7 days Exceptionally sweet and productive
Rubinka Cherry 5–7 days Early, reliable cherry tomato
Crokini F1 Cherry 5–7 days Award-winning, high sugar content
Goldwin F1 Cherry / blight resistant 5–7 days Golden cherry with disease resistance
Tumbling Tom Cherry / trailing 5–7 days Ideal for baskets and containers
Moneymaker Salad 5–10 days Traditional slicing tomato
Alicante Salad 5–10 days Early cropping and dependable
Alisa Craig Salad / traditional 5–10 days Classic flavour variety
Roma VF Plum / Roma 6–10 days Excellent for sauces and cooking
Bellandine F1 Plum / Roma 6–10 days Large plum fruit for preserving
Knockout F1 Beefsteak 7–10 days Very large fruits, needs warmth
BushSteak F1 Compact beefsteak 7–10 days Beefsteak size on a compact plant
Crimson Crush F1 Salad / blight resistant 5–10 days Reliable even in poor summers
Merrygold F1 Cherry / blight resistant 5–7 days Orange cherry with good resistance
BigDaddy F1 Beefsteak 7–10 days Large, flavourful fruits

Why Tomato Seeds Sometimes Fail to Germinate

Tomato seeds are generally very reliable. When problems occur, they are usually caused by growing conditions rather than the seed itself.

  • Compost that is too cold
  • Overwatering
  • Old or poorly stored seed
  • Seeds sown too deeply

What to Expect After Germination

Most tomato seedlings emerge quickly and evenly. Once seedlings appear, move them into strong light immediately and maintain temperatures around 18–20°C.

Strong early growth leads to sturdier plants, earlier flowering and improved yields later in the season.

When to Give Up on Tomato Seeds

Most viable tomato seeds will germinate within 14 days. If nothing has appeared after two weeks, check compost temperature and moisture levels before resowing.