What Month to Plant Tomatoes in Seattle

Tomatoes are a summer staple in many gardens, including those in Seattle. However, with its unique climate, it can be tricky to know exactly when to plant tomatoes in the Emerald City. In this article, we'll explore the best time to plant tomatoes in Seattle and provide some tips for a successful harvest.

Understanding Seattle's Climate

Seattle has a temperate marine climate, which means it has mild temperatures and plenty of precipitation. The city's location near the coast also means it experiences cooler summers and milder winters than other areas of the state. Average temperatures during the summer months range from the mid-60s to mid-70s.

While this might sound ideal for growing tomatoes, Seattle's weather patterns can be unpredictable. The city experiences periodic heat waves that can damage plants, and its high humidity can cause fungal diseases to spread quickly. Therefore, it's important to select the right time to plant your tomatoes to avoid these risks.

The Best Time to Plant Tomatoes in Seattle

The best time to plant tomatoes in Seattle is in late May or early June when the threat of frost has passed. At this time, daytime temperatures are warm enough for tomato plants to thrive, and the cool nights help prevent the spread of fungal diseases. Be sure to check the extended weather forecast before planting, and wait until any heat waves have passed before putting your plants into the ground.

If you want to get a head start on your tomato crop, you can start seeds indoors in March or April. This way, you can transplant your seedlings outdoors in May or June. Keep in mind that tomato plants need plenty of sunlight, so be sure to choose a spot in your garden that gets at least six hours of direct sunlight a day.

Tips for Growing Tomatoes in Seattle

While tomatoes are relatively easy to grow, there are a few tips to keep in mind if you're growing them in Seattle. Here are a few things to keep in mind:

Choose disease-resistant varieties to avoid issues with fungal diseases.

Provide support for your tomato plants to prevent them from collapsing under the weight of heavy fruit.

Water your plants regularly, but avoid getting water on the leaves to prevent fungal diseases. Drip irrigation or a soaker hose can be useful for this.

Consider planting companion plants, such as basil or marigolds, which can help repel insects.

Conclusion

By understanding Seattle's climate and selecting the right time to plant your tomatoes, you can enjoy a bountiful crop of fresh, juicy tomatoes all summer long. With a little care and attention, your tomato plants will thrive in this unique and beautiful city.