When to Plant Tomatoes in Seattle, WA

Tomatoes are a popular and versatile vegetable to grow in Seattle. However, knowing when to plant them is crucial to ensuring a successful harvest. Here are some factors to consider before planting your tomatoes in Seattle.

Climate Conditions

Seattle has a mild maritime climate that can be challenging for tomato plants. May is the best time to plant tomatoes as the temperature begins to warm up. However, Seattle's weather can be unpredictable, so it's best to pay close attention to the weather forecast and be prepared for sudden drops in temperature or unexpected rain. If the temperature suddenly drops below 55 degrees Fahrenheit, tomato plants can suffer from stunted growth or even die. It's crucial to ensure that soil temperatures are warm enough before planting your tomatoes.

Soil and Fertilizer

Tomatoes need well-draining soil and adequate amounts of nutrients to grow well. Seattle's soil tends to be clayey, so it's essential to add compost or other organic matter to improve its drainage and nutrient content. You can also add a balanced fertilizer before planting your tomatoes, and then again during the growing season. This will give your tomato plants the nutrients they need to grow strong and healthy.

Choosing the Right Varieties

Not all tomato varieties are well-suited for Seattle's climate. When choosing which varieties to plant, consider those that have a short growing season and are disease-resistant. Short-season tomato varieties include Early Girl, Oregon Spring, and Stupice. Disease-resistant varieties include Defiant, Mountain Merit, and Iron Lady. Choosing the right varieties can help ensure a successful harvest.

Planting and Care

When planting your tomato plants, make sure to provide adequate spacing between each plant. Each tomato plant should be at least two feet apart to ensure proper air circulation, which will reduce the likelihood of disease. It's also essential to stake or cage your tomato plants to support their growing stems and fruits. Tomatoes need plenty of sunshine to grow, so plant them in a spot that receives at least six hours of direct sunlight daily. Water your tomato plants evenly throughout the growing season, but avoid overwatering, as this can lead to root rot. Regularly prune your tomato plants to remove suckers and encourage larger fruits.

Conclusion

In summary, the best time to plant tomatoes in Seattle is in May, when the temperature begins to warm up. Make sure to choose disease-resistant and short-season tomato varieties, add organic matter to improve soil drainage and nutrient content, and provide adequate support and care for your plants throughout the growing season. With these tips, you can successfully grow delicious tomatoes in Seattle.