Update Location
Enter a ZIP code to get product recommendations and information tailored to your area.
Can I Treat Weeds With Roundup® Weed & Grass Killer Products When It's About to Rain?
Discover the answer right here.
For best results, we recommend using Roundup® products on dry, warm, wind-free days. But if it's about to rain, fear not — all of our products should dry and become rainfast in as fast as 30 minutes to 3 hours.
Scroll down to a product to see the rainproof time.
Ideal Conditions
Spray when air is calm to prevent drift to desirable plants. For best results, apply Roundup® Weed & Grass Killer products during warm, sunny weather above 60°F. Apply Roundup® For Lawns products when daytime temperatures are between 45° and 90° F.
Weeds and Rain
Weeds love to sprout after it rains, which is why treating a few days after a nice rain is ideal. Additionally, choosing rain-free days for treatment ensures that the product remains effective without being washed away.
Landscape Weeds
Roundup® Weed & Grass Killer4 products
Rainproof in as fast as 30 MINUTES.
Lawn Weeds
Roundup® For Lawns1 Ready-to-Use (not registered for sale or use in New York)
Rainproof in as fast as 3 HOURS.
Concentrates
Roundup® Weed & Grass Killer4 Concentrates
Rainproof in as fast as 30 MINUTES.
Landscape & Hardscape Weeds
Roundup® Dual Action Weed & Grass Killer Plus 4 Month Preventer Products
Rainproof in as fast as 30 MINUTES.
Driveway & Patio Weeds
Roundup® Dual Action 365 Weed & Grass Killer Products (not registered for sale or use in New York)
Rainproof in as fast as 30 MINUTES.
Poison Ivy & Tough Brush
Roundup® Poison Ivy Plus Tough Brush Killer2 Products
Rainproof in as fast as 30 MINUTES.
How Often Should I Apply?
With Roundup® Weed amp; Grass Killer products, one application is usually all it takes to get rid of most pesky weeds.
How Do I Prevent Weeds From Coming Back?
Removing weeds is one thing, but preventing weeds from coming back can be its own challenge.
How Soon Can I Replant After Using Roundup® Weed & Grass Killer Products?
It depends on the Roundup® Brand Products you choose.
How Soon Can I Reseed After Using Roundup® For Lawns Products?
Roundup® For Lawns is so effective at killing weeds that you may find some bare spots in your lawn