The Best Time of the Year to Plant Grass in Western Washington

Sowing a mix of appropriate seed into well-drained, fertile soil that receives plenty of sun is the best way to ensure the success of your lawn. Western Washington's summers are dry, so take advantage of the winter moisture as soon as the weather warms up.

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Planting at the right time can give your lawn the best chance of success.

Planting Season

According to the Washington State Nursery and Landscape Association, early April to late May is the best time to plant grass seeds. This allows the grass to take advantage of spring rains and warmth to become established before the dry season sets in.

Seed Types

The University of Washington's Botanic Gardens recommends a 90 percent mix of tall fescue and perennial rye for the western Washington lawn, and various bentgrasses flourish as well. Avoid bluegrass, Bermuda and Saint Augustine grass. While buffalo grass is common in eastern Washington, it does not do well west of the Cascades.

Tips for Success

Mix organic matter into heavy clay soil to add structure before sowing. Do not spread general pesticides, which kill beneficial insects as well as pests. Perform frequent light waterings instead of infrequent soakings to encourage deep root growth, and use compost or manure instead of chemical fertilizer. Set your mower blade high and leave the grass clippings on the ground to add nitrogen back to the soil.


Angela Brady

Angela Brady has been writing since 1997. Currently transitioning to a research career in oncolytic virology, she has won awards for her work related to genomics, proteomics, and biotechnology. She is also an authority on sustainable design, having studied, practiced and written extensively on the subject.