Lawn Care Schedule for Helena, MT

Spring core aeration

Opens when soil thaw completes, expected March to May

Spring overseeding (cool-season)

Opens when 2-inch soil sits between 50°F and 65°F, expected March to May

Spring pre-emergent timing

Opens when 2-inch soil sits between 50°F and 55°F, expected April to May

Cool-season spring nitrogen

Opens when 2-inch soil holds 55°F, expected April to May

Spring broadleaf post-emergent

Opens when 2-inch soil holds 60°F, expected April to May

Summer iron (foliar) application

Opens when 2-inch soil holds 70°F, expected June to August

Summer mowing-height adjustment (cool-season)

Opens when 2-inch soil holds 75°F, expected June to August

Summer drought-stress watering (cool-season)

Opens when 2-inch soil holds 80°F, expected July to August

White-grub emergence watch

Opens when 2-inch soil holds 70°F, expected July to August

Fall overseeding (cool-season)

Opens when 2-inch soil sits between 60°F and 70°F, expected August to September

Fall core aeration (cool-season)

Opens when 2-inch soil sits between 55°F and 70°F, expected August to October

Fall pre-emergent (Poa annua)

Opens when 2-inch soil sits between 65°F and 70°F, expected September to October

Cool-season fall nitrogen

Opens when 2-inch soil sits between 55°F and 65°F, expected September to October

Fall soil test

Opens when 2-inch soil drops below 65°F, expected September to November

Cool-season late-fall (winterizer) nitrogen

Opens when 2-inch soil sits between 40°F and 55°F, expected October to November

Fall lime application

Opens when 2-inch soil drops below 60°F, expected October to November

Winter dormant watering (cool-season)

Opens when 2-inch soil drops below 40°F, expected December to February