Weeds growing through driveway cracks are hard to pull and quick to return. The right weed killer depends on whether you want to clear existing growth only or also prevent new weeds from sprouting. These five ready-to-use sprays are designed for outdoor areas such as driveways and walkways, but they differ in how quickly they show results, how soon they become rainproof, and how long they help prevent regrowth.
For most driveway cracks, a targeted spray is the practical choice. If you want longer-lasting bare ground, a product with a preventer may be a better fit—but consider whether you may want plants to grow there later. Always follow the product label, aim carefully, and keep spray off vegetation you want to protect.
Table of Contents
Quick Comparison
| Product | Best for | Key details |
|---|---|---|
| Spectracide Weed & Grass Killer with AccuShot Power Sprayer | Targeting existing weeds in cracks | Visible results in as fast as 3 hours; rainfast after 15 minutes |
| Ortho GroundClear Weed & Grass Killer with Comfort Wand | Fast contact action | Results in 15 minutes; rainproof in 2 hours once dry |
| Roundup Dual Action 365 Weed & Grass Killer | Killing weeds and preventing new growth | Up to 12 months of prevention; rainproof in as fast as 30 minutes |
| Ortho GroundClear Year Long Vegetation Killer | Keeping non-lawn areas clear | Total vegetation control with prevention for up to 1 year |
| Roundup Dual Action Weed & Grass Killer + 4 Month Preventer | Shorter-term weed prevention | Kills existing weeds and prevents new growth for up to 4 months |
Our Picks: Best Weed Killer For Driveway Cracks reviews
1. Spectracide Weed & Grass Killer: Best for Targeted Crack Treatment
Spectracide is a straightforward option when your main goal is to kill weeds and grass already growing in driveway cracks. It is also listed for walkways and other outdoor areas, so you can use the included AccuShot power sprayer to target growth along hard surfaces and around other listed spots.
The extendable wand and continuous power spraying are useful when weeds are spread across a long driveway or sit low in a crack. The product description says it kills to the root, with visible results in as fast as 3 hours. It is rainfast after 15 minutes, which gives you a relatively short wait before rain or watering is less likely to affect the application.
Unlike the preventers below, this pick is best viewed as a treatment for existing weeds rather than a way to keep a crack bare for months. That can be an advantage if you do not want a long-lasting vegetation barrier, but you may need to treat new growth as it appears. As with any broad weed-and-grass spray, careful aim matters near plants you want to keep.
Pros:
- Designed for use on driveways and walkways.
- AccuShot sprayer has an extendable wand and continuous spray.
- Visible results can appear in as fast as 3 hours.
- Rainfast after 15 minutes, according to the product description.
Cons:
- Does not advertise a long-term weed-prevention period.
- Requires careful aiming around desirable plants and grass.
Verdict: Choose Spectracide if you want a targeted treatment for existing driveway weeds with a sprayer designed to make reaching cracks easier.
2. Ortho GroundClear Weed & Grass Killer: Best for Fast-Acting Contact Control
This Ortho GroundClear formula is meant to kill listed weeds and grasses on contact, including dandelions, chickweed, crabgrass, and moss. Its stated 15-minute results make it the quickest option in this group for visible action, though visible changes are not the same as a promise that every weed will be fully gone at that point.
The 1.1-gallon container comes with a Comfort Wand for targeting weeds without having to apply the product by hand. The formula is intended for areas such as driveways and walkways, and the product description says it becomes rainproof in 2 hours once dry. For best results, it calls for application when weeds are small, actively growing, and not wet from rain, dew, or irrigation.
This is a good fit if you want to treat current growth and do not need a stated months-long prevention period. It is not for use on lawns, so it is not the right choice for weeds growing in grass beside the driveway. The product is described as OMRI Listed for Organic Use; that designation does not replace the need to read and follow the label.
Pros:
- Lists fast visible action in 15 minutes.
- Comfort Wand helps direct spray at individual weeds.
- Targets a range of listed weeds, including moss and crabgrass.
- Suitable for driveway and walkway use as directed.
Cons:
- Not for use on lawns.
- Must be dry for the stated 2-hour rainproof period to apply.
Verdict: Pick this Ortho spray if fast contact action and an easy-to-handle wand matter more to you than long-term prevention.
3. Roundup Dual Action 365: Best for Extended Weed Prevention
Roundup Dual Action 365 is made for people who want to kill existing growth and help stop new weeds from appearing in the same area. The product description lists driveway cracks, sidewalks, walkways, patios, paths, gravel areas, and other non-lawn spots as possible use areas. It claims prevention for up to 12 months, making it the longest stated prevention period among these picks.
The included Comfort Wand has one-touch continuous spray, a useful feature if you are treating several cracks or a longer stretch of pavement. The product is rainproof in as fast as 30 minutes and is described as producing visible results in hours. It targets many types of weeds and grasses, including clover, dandelion, and crabgrass.
That long prevention window is also the main trade-off. It makes this a poor match for a crack or nearby area where you may want vegetation to grow again soon. The prevention period is a product claim, not a guarantee for every site or condition, so check the label for use directions and any restrictions before applying.
Pros:
- Kills existing weeds and helps prevent new growth for up to 12 months.
- Specifically lists driveway cracks and other hardscape areas.
- One-touch continuous spray can reduce repeated hand pumping.
- Rainproof in as fast as 30 minutes.
Cons:
- Long prevention may not suit areas where you want plants to return.
- Not intended for lawn use.
Verdict: Choose Roundup Dual Action 365 when you want to treat driveway weeds and prefer the longest stated prevention period in this lineup.
4. Ortho GroundClear Year Long: Best for Bare, Non-Lawn Areas
Ortho GroundClear Year Long is a total vegetation killer for spots where you want to clear existing weeds and grass and prevent regrowth for up to a year. The listed use areas include driveways, sidewalks, gravel, parking areas, rock landscapes, spaces under decks, and along fences. That makes it suited to more than a few isolated cracks if you also need to manage a larger non-lawn area.
The ready-to-use 1-gallon container includes a Comfort Wand for continuous spray and targeted application. The product description says the formula starts working immediately and kills weeds to the root when used as directed. It also recommends applying when weeds are actively growing on a sunny day with temperatures above 60°F for best results and prevention.
The broad vegetation-control purpose is worth considering before you buy: this is not a selective treatment for weeds alone. Use it only where you are comfortable controlling vegetation, and take care around plants you want to preserve. Its year-long prevention claim makes it less flexible than a product that treats existing weeds without advertising an extended barrier.
Pros:
- Designed to kill existing vegetation and prevent regrowth for up to 1 year.
- Lists driveways, sidewalks, gravel, and parking areas as use locations.
- Includes a Comfort Wand for directed, continuous spray.
- Ready-to-use format avoids separate mixing.
Cons:
- Total vegetation control is not a good fit near plants you want to keep.
- Long-lasting prevention can limit flexibility in the treated area.
Verdict: This Ortho option makes sense for driveway cracks and other non-lawn areas you want to keep largely vegetation-free for an extended period.
5. Roundup Dual Action + 4 Month Preventer: Best for a Shorter Prevention Window
This Roundup formula combines treatment for existing weeds and grass with prevention for up to 4 months. That shorter stated window can be a useful middle ground: it offers more than a one-time treatment, without the up-to-12-month prevention claim of the other Roundup Dual Action option.
The product is listed for hardscapes and landscapes, including driveways, sidewalks, patios, fences, and gravel areas. Its Sure Shot Wand has a protective shield intended to help target spray in garden beds and landscaped areas. The product description also says it is rainproof in as fast as 30 minutes and produces visible results in as fast as 6 hours.
Compared with the 365-day preventer, this option may suit you better if you want a more limited prevention period. However, prevention can still be a drawback where new plants or grass may be wanted during that time. The description says ornamental bedding plants, trees, shrubs, sod, and seed can be planted 4 months after application; check the label for exact directions and timing.
Pros:
- Kills existing weeds and grass and prevents new growth for up to 4 months.
- Sure Shot Wand shield helps direct spray in landscaped areas.
- Rainproof in as fast as 30 minutes.
- Can be used on listed hardscape and landscape areas.
Cons:
- Prevention period is shorter than the year-long options.
- Not ideal where you need vegetation to grow back within the stated prevention period.
Verdict: Choose this Roundup if you want weed prevention in driveway cracks but prefer a shorter stated window than a year-long formula.
How to Choose a Weed Killer for Driveway Cracks
Decide Whether You Need a Killer, a Preventer, or Both
Some products in this guide focus on killing the weeds already growing, while others also claim to prevent new growth for a set period. If you only have a few weeds and do not mind treating fresh growth later, a product without a stated long prevention window may be enough. If weeds return often and you want a longer-lasting bare area, compare the prevention claims—but keep in mind that longer control may be a poor fit if you later want plants to grow in that spot.
Match the Prevention Period to Your Plans
The products here advertise prevention periods ranging from four months to up to a year. Think about what you want the area to look like during that time, including whether you may repair the driveway, add landscaping, or plant nearby. Follow the label for planting guidance and restrictions; do not assume all preventers have the same rules.
Check That the Label Lists Your Surface and Location
Driveway cracks are a specific treatment area, but you may also be dealing with weeds along a walkway, gravel edge, patio, or fence. Check that your intended location is listed on the product label. Also note whether a formula is restricted from use on lawns, as one option in this guide is.
Consider the Sprayer and Reach
A wand can help direct product into narrow cracks and reduce the need to bend over repeatedly. Continuous-spray designs may be useful if you have many weeds to treat, while a shielded wand can help with aiming near landscaped areas. No sprayer removes the need for care: apply only to the weeds and locations allowed by the label.
Plan Around Rain and Weed Conditions
Rainfast times differ across these products, from 15 minutes to 2 hours once dry. Check the label and forecast before applying, and follow any instructions about how dry or actively growing the weeds should be. The Ortho contact formula, for example, recommends treating small, actively growing weeds that are not wet from rain, dew, or irrigation.
Use Extra Care Around Desired Plants
Weed-and-grass killers can harm vegetation they contact, so avoid drift and overspray around lawns, flowers, shrubs, and trees. Read the label before application, use only the directed amount, and keep people and pets away as the label instructs. If weeds are growing right beside plants you want to keep, a shielded or extendable wand may help with control, but careful application is still essential.
Frequently Asked Questions
What is the best type of weed killer for cracks in a driveway?
For existing weeds only, look for a product labeled for driveway or hardscape use and apply it directly to the growth. If you also want to reduce new weeds, consider a preventer and choose a prevention period that fits your plans for the area.
Which product in this guide has the longest stated prevention period?
Roundup Dual Action 365 and Ortho GroundClear Year Long both advertise prevention for up to a year. Their broad vegetation-control purpose makes them best suited to areas where you want to keep vegetation from returning, rather than places you plan to replant soon.
Which option has the fastest stated visible results?
Ortho GroundClear Weed & Grass Killer lists results in 15 minutes. Spectracide lists visible results in as fast as 3 hours, while the Roundup options describe visible results in hours or as fast as 6 hours. Stated times are product claims; actual results can depend on conditions and correct use.
Can I use these products on my lawn?
Do not assume so. Ortho GroundClear Weed & Grass Killer is specifically described as not for use on lawns, and the other products are intended for listed non-lawn areas. Check each label before using any weed killer near or on turf.
How soon can rain fall after application?
It depends on the product. The supplied descriptions list rainfast or rainproof times of 15 minutes, 30 minutes, or 2 hours once dry. Follow the specific label instructions, since application conditions and drying time matter.
Will a weed killer keep weeds from coming back through a crack?
A product with a preventer may help limit new growth for its stated period, but results can vary by site and conditions. A product that kills existing weeds without a prevention claim may require repeat treatment when new growth appears.
How can I avoid damaging plants near the driveway?
Choose a product labeled for the location, aim the wand carefully, and avoid spraying in conditions that could carry product onto nearby vegetation. A wand or spray shield may help with placement, but always follow label precautions and protect plants you want to keep.
Final Recommendation
For treating existing weeds in driveway cracks without choosing a long prevention period, Spectracide Weed & Grass Killer is a practical all-around pick thanks to its extendable AccuShot sprayer and 15-minute rainfast claim. If your priority is keeping cracks clear for longer, Roundup Dual Action 365 or Ortho GroundClear Year Long offers a stated prevention period of up to a year. Choose based on how long you want the area kept bare, and follow the product label carefully.
