How Late Can You Kill Lawn Weeds in Fall?
I have had great success killing lawn weeds in fall. As long as your daily temps are reaching a high of 45 degrees or more the day you spray, you can kill pesky perennial weeds like Dandelion, Clover and Ground Ivy (Creeping Charlie), as well as annual weeds like Chickweed and Henbit. Kill them this fall and they will not be in your lawn next spring.
There are various Ortho Weed-B-Gon products depending on where you live. Click here to see your options.
Note: If you planted grass seed this fall, it is best to wait until the new seedlings have been mowed 4 times before you apply weed killers.