Boise 7 N lawn care, month by month
| Month | Tasks |
|---|---|
| January | Dormant — keep leaves cleared, stay off frozen turf |
| February | Dormant — keep leaves cleared, stay off frozen turf |
| March | Dormant — keep leaves cleared, stay off frozen turf |
| April | Apply crabgrass pre-emergent |
| May | Apply crabgrass pre-emergent · Light feeding after green-up |
| June | Light feeding after green-up |
| July | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat |
| August | Aerate + overseed · Main fall feeding |
| September | Main fall feeding · Winterizer feeding |
| October | Final mow of the year |
| November | Dormant — keep leaves cleared, stay off frozen turf |
| December | Dormant — keep leaves cleared, stay off frozen turf |
Reading the Boise 7 N lawn year
Boise 7 N 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 Aug 13 – Aug 28, and the year's main feeding all land before the Oct 12 frost closes the year. With only ~148 frost-free days, the fall window is tight — miss it and the next real chance is spring.
Grasses that fit Boise 7 N
Frequently asked questions
When should I overseed my lawn in Boise 7 N?
For cool-season grass (bluegrass, fescue, ryegrass), overseed in early fall — in Boise 7 N that means roughly Aug 13 – Aug 28, timed 45–60 days before the average first fall frost (Oct 12) so seedlings establish before cold. Spring works as a backup but collides with crabgrass season.
When do I put down crabgrass preventer in Boise 7 N?
Aim for Apr 26 – May 17 — the estimated stretch when Boise 7 N soil approaches the ~55°F germination threshold, anchored to the average last frost (May 17). 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 Boise 7 N?
Keep mowing as long as the grass grows — in Boise 7 N that's typically until Oct 5 – Oct 26, around the average first fall frost (Oct 12). Take the final cut slightly shorter to discourage snow mold.
What grass grows best in Boise 7 N?
Idaho is cool-season country: Kentucky bluegrass, tall fescue, perennial ryegrass, fine fescue. See the grass guides linked below for identification and care.