Whidbey Island NAS lawn care, month by month
| Month | Tasks |
|---|---|
| January | Dormant — keep leaves cleared, stay off frozen turf |
| February | Apply crabgrass pre-emergent |
| March | Apply crabgrass pre-emergent · Light feeding after green-up |
| April | Light feeding after green-up |
| 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 | Aerate + overseed · Main fall feeding |
| October | Main fall feeding · Winterizer feeding |
| November | Final mow of the year |
| December | Dormant — keep leaves cleared, stay off frozen turf |
Reading the Whidbey Island NAS lawn year
Whidbey Island NAS 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 Sep 15 – Sep 30, and the year's main feeding all land before the Nov 14 frost closes the year.
Grasses that fit Whidbey Island NAS
Frequently asked questions
When should I overseed my lawn in Whidbey Island NAS?
For cool-season grass (bluegrass, fescue, ryegrass), overseed in early fall — in Whidbey Island NAS that means roughly Sep 15 – Sep 30, timed 45–60 days before the average first fall frost (Nov 14) so seedlings establish before cold. Spring works as a backup but collides with crabgrass season.
When do I put down crabgrass preventer in Whidbey Island NAS?
Aim for Feb 20 – Mar 13 — the estimated stretch when Whidbey Island NAS soil approaches the ~55°F germination threshold, anchored to the average last frost (Mar 13). 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 Whidbey Island NAS?
Keep mowing as long as the grass grows — in Whidbey Island NAS that's typically until Nov 7 – Nov 28, around the average first fall frost (Nov 14). Take the final cut slightly shorter to discourage snow mold.
What grass grows best in Whidbey Island NAS?
Washington is cool-season country: Kentucky bluegrass, tall fescue, perennial ryegrass, fine fescue. See the grass guides linked below for identification and care.