Step-by-step: what to do each season (and why)
Use this as your repeatable annual routine. When you do the right work at the right time, lawns in Kuna can stay thick and resilient without feeling like a weekly battle.
1) Early Spring (March–April): stop weeds before they start
Best focus: pre-emergent weed control and a clean “wake-up” for turf.
Checklist
• Apply pre-emergent before soil temps stabilize around 55°F (often late March locally).
• Start mowing once growth begins—avoid scalping; keep your mower blade sharp.
• Water only as needed; cool-season lawns often don’t need heavy irrigation yet when temps are still mild.
2) Late Spring (May–June): build density without overfeeding
Best focus: mowing strategy, irrigation coverage, and targeted weed control.
Raise mowing height as temperatures climb. Taller grass shades the soil, reduces evaporation, and protects crowns from heat stress. Walk your irrigation zones and look for dry arcs, clogged nozzles, and overspray onto sidewalks. Many patchy lawns are “watering pattern problems,” not fertilizer problems.
3) Summer (July–August): defend the lawn (deep roots win)
Best focus: deep/infrequent watering, pest monitoring, and stress reduction.
If you only improve one habit, make it this: water deeply, then let the lawn dry down a bit before watering again. That pattern pushes roots deeper and helps turf handle Treasure Valley heat.
Grub timing tip
Preventive grub control is often targeted in early-to-mid summer so product is in place when young grubs hatch (commonly July/early August). If you’ve had skunks, raccoons, or birds tearing up turf, or you can pull back sod like a loose carpet, it’s worth checking quickly—grub damage escalates fast.
4) Early Fall (late August–September): the season that rebuilds lawns
Best focus: aeration, overseeding, and your most important fertilization window.
Cool nights and warm soil create ideal conditions for root growth and seed establishment. University Extension guidance commonly points to late summer/fall as the best time to seed cool-season grass in Idaho. This is also when core aeration pays off: it reduces compaction, improves water infiltration, and creates better seed-to-soil contact.
Pair aeration with overseeding if your lawn is thin, and follow with a smart fall feeding to help turf recover from summer stress and store energy for winter.
5) Late Fall (October–November): winterize systems and finish strong
Best focus: leaf management and sprinkler winterization.
Don’t let thick leaves smother grass going into winter—mulch-mow light leaf fall or remove heavy accumulation. For irrigation, plan a blowout/winterization before hard freezing temperatures become routine. Most local scheduling pushes homeowners toward mid-to-late October in the Treasure Valley, with weather-dependent flexibility.