Growing Basil in Seattle
🇺🇸 Zone 7 Planting Guide · Warm-summer Mediterranean climate
Quick Answer: Growing Basil in Seattle
Yes, you can grow Basil in Seattle, US! Plant during Mar, Apr, May, Jun for best results. Seattle is in USDA Zone 7 with a Warm-summer Mediterranean climate, offering 250 frost-free days per year. The difficulty level is easy, and Basil takes 50-75 days to harvest. Basil needs full sun and regular watering.
Climate Match Analysis
Seattle's climate requires careful timing. Winter lows (2°C) drop below Basil's minimum (10°C), so avoid cold months. Follow the recommended planting months for success.
Seattle Climate Data
Basil Planting Calendar for Seattle
Green months show the best time to plant Basil in Seattle
Basil Growing Requirements
Sunlight
Full Sun
6+ hours direct sunlight
Water
Regular
Consistent moisture, 1-2 inches/week
Days to Harvest
50-75
From planting to first harvest
Difficulty
Great for beginners
💡 Growing Tips for Basil
Pinch flower buds to encourage leaf growth. Harvest from top down. Wait until soil warms to at least 20°C before transplanting outdoors — cold soil stunts growth and can invite root rot. Aim for about 2.5 cm of water per week, adjusting for rainfall. Organic mulch around the base helps maintain even moisture.
Frost tolerance: Basil is NOT frost tolerant — wait until after the last frost in Seattle.
Companion Plants for Basil
Find out which plants grow best alongside Basil — and which to keep apart
Grow Basil Indoors
No garden? Learn how to grow Basil indoors with our complete guide
How to Grow Basil in Seattle
Seattle, US is in USDA Hardiness Zone 7 with a Warm-summer Mediterranean climate (Köppen Csb). With winter lows of 2°C and summer highs of 24°C, the growing season spans approximately 250 frost-free days. Basil is one of the easiest plants to grow in this climate.
Basil thrives in temperatures between 20°C and 30°C, requiring full sun and regular watering. In Seattle, the best months to plant Basil are March, April, May, June. Basil is not frost tolerant, so it's important to wait until after the last spring frost before transplanting outdoors. Expect to harvest in approximately 50-75 days after planting.
With 953mm of annual rainfall, Seattle provides moderate natural moisture. You'll likely need to supplement with regular watering, especially during the growing season.
Other Plants That Grow in Seattle
More plants you can grow alongside Basil in Seattle
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Frequently Asked Questions
Can I grow basil in Seattle?
Yes! Basil can be successfully grown in Seattle, US. Seattle is in USDA Hardiness Zone 7 with a Warm-summer Mediterranean climate. The difficulty level for growing Basil here is rated "easy". The best months to plant are March, April, May, June.
When should I plant basil in Seattle?
In Seattle, the recommended planting months for Basil are March, April, May, June. Seattle has 250 frost-free days per year, with winter lows of 2°C and summer highs of 24°C. Since Basil is not frost tolerant, make sure to plant after the last frost date.
How long does basil take to grow in Seattle?
Basil typically takes 50-75 days from planting to harvest. In Seattle's Warm-summer Mediterranean climate with 250 frost-free days, you have plenty of time to grow Basil to maturity. Pinch flower buds to encourage leaf growth. Harvest from top down. Wait until soil warms to at least 20°C before transplanting outdoors — cold soil stunts growth and can invite root rot. Aim for about 2.5 cm of water per week, adjusting for rainfall. Organic mulch around the base helps maintain even moisture.
Can I grow basil indoors in Seattle?
Basil can potentially be grown indoors in Seattle with proper conditions. It requires full sun (6+ hours of direct light — a south-facing window or grow lights recommended). Indoor growing extends your season beyond the Mar, Apr, May, Jun outdoor planting window. Use containers with good drainage and regular watering.
What month do I plant basil in Seattle?
Plant Basil in Seattle during March, April, May, June. These are the optimal months based on Seattle's USDA Zone 7 climate, 250 frost-free days, and temperature range of 2°C to 24°C.
Is basil hard to grow in Seattle?
Basil is rated "easy" to grow in Seattle. This is a great choice for beginners — it is forgiving and adapts well to this climate. The climate match for Basil in Seattle is Moderate.
What grows well with basil in Seattle?
In Seattle, you can grow many companion plants alongside Basil. Good options from the same planting window include Tomato, Lettuce, Carrot, Pepper and 2 more. These plants share similar planting months and thrive in Seattle's Zone 7 climate.
Does basil need full sun in Seattle?
Basil requires full sun. In Seattle, provide at least 6 hours of direct sunlight daily. Most garden locations with southern exposure will work well.