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Timing is one of the most underrated factors in a landscape project’s success. Plant something in July without irrigation, and it’ll struggle through summer drought. Pour concrete in December, and curing times double. Call a landscape company in April hoping to start in May, and you’ll likely be waiting until July.
Seattle’s climate creates a surprisingly specific calendar for landscape work. Our mild winters allow construction almost year-round, but the wet season brings complications. Summer is the most popular time to build, which means longer lead times.
The articles in this guide break down the seasonal dynamics that affect landscape projects across Greater Seattle and Greater Seattle. When to plant for the best establishment, when to build for the best scheduling and pricing, how far ahead to start the design process, and what happens if you wait too long. Classic Landscaping’s crews work through every season — spring planting windows, summer build backlogs, and fall’s underrated advantages — and this accumulated calendar knowledge can save you months of delay and meaningful money on your project.
The best time to start the process is fall (September-November). Design work happens during winter when firms have more availability, and you’re positioned for a spring construction start when conditions are ideal.
For most trees, shrubs, and perennials in the PNW, fall planting gives significantly better results. Fall-planted material gets 5-6 months of cool, wet weather to establish roots before summer drought arrives.
Hardscape construction can proceed through most of the wet season. What doesn’t work well in heavy rain: fine grading, lawn installation, and large-scale planting in saturated soil.
For a design-build project, 3-6 months before your desired construction start is ideal. During peak season, construction backlogs can run 6-10 weeks.
Material prices are generally consistent year-round, but labor availability during peak season means less flexibility. A project designed in winter and built in early spring typically delivers the best balance of cost, quality, and timing.
Spring: Cleanup, edge beds, pre-emergent weed control, start mowing. Summer: Deep watering, deadheading, summer pruning. Fall: Core aerate, overseed, plant trees/shrubs, fall fertilizer. Winter: Prune deciduous trees, plan next year’s projects.
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