When to Plant Tomato Seeds in Seattle

Tomatoes are a popular vegetable to grow in Seattle due to the mild climate and relatively long growing season compared to other areas in the Pacific Northwest. However, it is important to make sure that you plant your tomato seeds at the right time to ensure that they have enough time to mature before the colder weather sets in. In this article, we will discuss the best time to plant tomato seeds in Seattle and some tips for successful tomato growing.

Planting Season

The ideal time to plant tomato seeds in Seattle is around April or May when the soil has warmed up to at least 55-60 degrees Fahrenheit. This is when the temperature is ideal for the tomato seeds to germinate, and you can begin transplanting your seedlings outdoors by late May or early June.

If you try to plant your seeds too early, they may struggle to germinate due to the colder soil temperatures, and you may have to replant. On the other hand, if you plant too late, the tomatoes may not have enough time to fully mature before the colder weather sets in.

Planting Tips

When planting your tomato seeds, make sure to choose a location that gets at least six to eight hours of direct sunlight each day. Tomatoes also prefer well-draining soil with a pH level between 6.0-7.0.

You can start your seeds indoors about six to eight weeks before the last frost date in Seattle. This will give your seedlings a head start and ensure that they are ready to be transplanted before the colder weather sets in. When transplanting your seedlings, make sure to plant them deeply in the soil, burying the stem up to the first set of leaves. This will encourage the development of a strong root system and a sturdy plant.

Caring for Your Tomatoes

After you have planted your tomatoes, make sure to water them regularly and provide them with support as they grow. As the plants start to flower, you can also add fertilizer that is high in potassium to encourage the development of fruit. However, be careful not to over-fertilize as this can lead to too much foliage growth and less fruit development.

You should also keep an eye out for common tomato diseases such as blight, which can be caused by too much moisture, and blossom-end rot, which can be caused by uneven watering or calcium deficiencies. To prevent these issues, make sure to water your tomatoes regularly and evenly, and use a fungicide if necessary.

In Conclusion

Planting tomatoes in Seattle can be a rewarding experience, but it is important to make sure that you plant your seeds at the right time and care for your plants properly. By following the tips and guidelines in this article, you can be well on your way to a successful tomato harvest in Seattle.