Portland lawn care, month by month
| Month | Tasks |
|---|---|
| January | Dormant — keep leaves cleared, stay off frozen turf |
| February | Apply crabgrass pre-emergent · Light feeding after green-up |
| March | Light feeding after green-up |
| April | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat |
| May | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat |
| June | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat |
| July | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat |
| August | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat |
| September | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat |
| October | Aerate + overseed · Main fall feeding |
| November | Main fall feeding · Winterizer feeding · Final mow of the year |
| December | Final mow of the year |
Reading the Portland lawn year
Portland runs on the classic northern rhythm: a short, important spring (pre-emergent before soil hits 55°F, one light feeding), a defensive summer (mow tall, water deep, feed nothing), and then the season that actually builds a lawn — early fall, when aeration, overseeding around Oct 2 – Oct 17, and the year's main feeding all land before the Dec 1 frost closes the year.
Grasses that fit Portland
Frequently asked questions
When should I overseed my lawn in Portland?
For cool-season grass (bluegrass, fescue, ryegrass), overseed in early fall — in Portland that means roughly Oct 2 – Oct 17, timed 45–60 days before the average first fall frost (Dec 1) so seedlings establish before cold. Spring works as a backup but collides with crabgrass season.
When do I put down crabgrass preventer in Portland?
Aim for Feb 4 – Feb 25 — the estimated stretch when Portland soil approaches the ~55°F germination threshold, anchored to the average last frost (Feb 25). It's an estimate: a soil thermometer reading 50–55°F at 2″ depth for several days is the precise trigger, and pre-emergent must go down before crabgrass sprouts, not after.
When should I stop mowing in Portland?
Keep mowing as long as the grass grows — in Portland that's typically until Nov 24 – Dec 15, around the average first fall frost (Dec 1). Take the final cut slightly shorter to discourage snow mold.
What grass grows best in Portland?
Oregon is cool-season country: Kentucky bluegrass, tall fescue, perennial ryegrass, fine fescue. See the grass guides linked below for identification and care.