Nature Park-Beaverton, OR Lawn Care Calendar

Every timing-sensitive lawn job in Nature Park-Beaverton, timed to the local climate record — not a national average.

Turf region
Cool-season
Kentucky bluegrass, tall fescue, perennial ryegrass, fine fescue
Last spring frost
Feb 11
median, 1991–2020
First fall frost
Dec 5
median, 1991–2020
Growing stretch
297 days
frost to frost
TaskNature Park-Beaverton windowWhy then
Crabgrass pre-emergent Jan 21 – Feb 11 Soil nearing 55°F — must beat germination
Light spring feeding Feb 11 – Mar 11 After green-up, before summer stress
Aerate + overseed Oct 6 – Oct 21 Fall growth surge; established before cold
Main fall feeding Oct 10 – Nov 7 The year’s most important nitrogen
Winterizer feeding Nov 7 – Nov 21 Root reserves for spring green-up
Final mow Nov 28 – Dec 19 Growth stops around first frost

Anchored to NOAA 1991–2020 climate normals at the NATURE PARK-BEAVERTON station. Windows are estimates — soil temperature is the real trigger, especially for pre-emergent. Check your own ZIP with the lawn calendar lookup.

Nature Park-Beaverton lawn care, month by month

MonthTasks
January Apply crabgrass pre-emergent
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 Nature Park-Beaverton lawn year

Nature Park-Beaverton 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 6 – Oct 21, and the year's main feeding all land before the Dec 5 frost closes the year.

Grasses that fit Nature Park-Beaverton

Frequently asked questions

When should I overseed my lawn in Nature Park-Beaverton?

For cool-season grass (bluegrass, fescue, ryegrass), overseed in early fall — in Nature Park-Beaverton that means roughly Oct 6 – Oct 21, timed 45–60 days before the average first fall frost (Dec 5) so seedlings establish before cold. Spring works as a backup but collides with crabgrass season.

When do I put down crabgrass preventer in Nature Park-Beaverton?

Aim for Jan 21 – Feb 11 — the estimated stretch when Nature Park-Beaverton soil approaches the ~55°F germination threshold, anchored to the average last frost (Feb 11). 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 Nature Park-Beaverton?

Keep mowing as long as the grass grows — in Nature Park-Beaverton that's typically until Nov 28 – Dec 19, around the average first fall frost (Dec 5). Take the final cut slightly shorter to discourage snow mold.

What grass grows best in Nature Park-Beaverton?

Oregon is cool-season country: Kentucky bluegrass, tall fescue, perennial ryegrass, fine fescue. See the grass guides linked below for identification and care.