Frisco, Colorado. The Town of Frisco is a Home Rule Municipality in Summit County, Colorado, United States. The population was 2,683 at the 2010 census. It is a popular town among skiers from around the world. Four major ski resorts are located in close proximity to Frisco: Copper Mountain, Breckenridge, Keystone, and Arapahoe Basin.
Waiting to Plant Seed. When you spread an herbicide over your lawn and then decide to patch bare spots, overseed or change your grass type to grow a new species from seed, you should wait at least a month with most pre-emergent weed killers.f you used a crabgrass preventer, that time frame might extend to four months. Check the herbicide manufacturer's label to confirm how long you must wait, as it can differ between herbicide products. The pre-emergent herbicides stop weed seeds from germinating, but they can stop grass seeds as well.
1 Wait two to four months to re-seed the lawn after using a pre-emergent herbicide. 2  Use a pre-emergent herbicide during late winter or during early spring of the next year to prevent any crabgrass seeds left behind from developing at the next opportunity.f the crabgrass seeds have already sprouted and crabgrass has appeared in your grass, the pre-emergent herbicide will do no good. However, you still have an option. Post-emergent herbicide products control crabgrass after it has already germinated. Post-emergent herbicides work by killing the crabgrass plants.