How long to wait before seeding?
Under good growing conditions, seeding may resume after 6 hours of an application of glyphosate if there was only annual weeds present. If tank mixing with other products or spraying under more stressful conditions (ex) cooler temperatures) wait a day before beginning to seed or starting other field work.
For perennial weeds, wait 72 hours after spraying in good growing conditions. If the weather is cool and cloudy, wait another day to allow sufficient time for the chemical to move to the roots of the weeds.
Spraying after frost
If the nighttime temperatures dip in the range of 0 to -4°C, it’s ok to spray the next day go as long as day time temps reach 8-10°C. If the temperatures are colder than -5°C, wait 1-2 days to assess the frost damage and see if the plants are beginning to actively grow again. A good rule of thumb is to look for at least 60% green material on a plant after a hard frost before going out and spraying.