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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.