Pacific Northwest Lawn Mowing Guide
The Pacific Northwest’s mild, wet climate keeps grass growing most of the year — and feeds moss just as well. The questions here aren’t about beating heat; they’re “can I mow a wet lawn?” (yes, with a sharp blade and a raised deck) and “how do I beat moss?” (fix the shade, drainage, and acidic soil — moss killer alone just resets the clock).
What grass do you have?
- Perennial ryegrass — fast to establish in cool soil; the regional default.
- Fine fescue — shade and low-input lawns; pairs well with ryegrass.
Mowing heights for Northwest grasses
| Grass | Mowing height | Notes |
|---|---|---|
| Perennial ryegrass | 1.5–2.5 in | Sharp blade matters — ryegrass shreds at low blade quality |
| Fine fescue | 2–3 in | Tolerates a higher, less-frequent cut and shade |
When the lawn is rarely dry, mow with a sharp blade and raise the deck slightly to avoid tearing and rutting wet turf.
Northwest mowing calendar
| Month | Mowing & lawn care |
|---|---|
| Jan | Slow growth; an occasional cut on a dry window. Moss is most visible now. |
| Feb | Late winter — apply moss control and address shade/drainage causes. |
| Mar | Growth accelerates; back to regular mowing. |
| Apr | Strong spring growth — mow weekly. |
| May | Peak growth; weekly or more. |
| Jun | Continued growth before the dry stretch. |
| Jul | Drier summer — growth slows; mow higher, less often. |
| Aug | Driest month; minimal mowing if unirrigated. |
| Sep | Fall rains return; growth resumes — overseed thin areas. |
| Oct | Active growth; weekly mowing. |
| Nov | Growth slows; mow on dry windows. |
| Dec | Minimal growth; occasional cleanup cut. |
Mowers & equipment
A sharp blade is non-negotiable for wet NW lawns. See our mowing height guide and best lawn mowers.
Get the full Northwest plan
📖 Lush Lawns Northwest — region-specific mowing heights, seasonal timing, and lawn care for Northwest (perennial ryegrass and fine fescue).