We don't give one number for walking or driving on new concrete, because the right time depends on the mix, the weather and the job, and the contractor who poured it should tell you in writing. What we can say from the sources: concrete cures rather than dries, curing normally runs at least 3 to 7 days, and the concrete should be kept moist and warm while it does. Keep people, vehicles and salt off until your contractor says otherwise.
Concrete sidewalk drying time is the question everyone types, but it hides a misunderstanding. Concrete does not simply dry out. It gains strength through a chemical reaction that needs moisture and the right temperature, which is called curing. If the surface dries out too early, the slab suffers. So the useful question is how long it should cure before it carries weight, and that answer comes from the contractor who poured it.
Drying versus curing
Concrete sets, then keeps gaining strength over days and weeks. Curing is the work of keeping it moist and at a workable temperature during that time. NRMCA says curing normally runs at least 3 to 7 days, and the concrete should be kept above 50 F (NRMCA).
Methods vary. A curing compound sprayed on the surface, or paper or plastic laid over it, holds moisture in. In cold weather the guidance is to use moisture-retaining curing, not wet curing, when freezing is expected (NRMCA). Starting curing early matters in wind and low humidity, where the surface can lose water faster than it bleeds it, which causes shallow plastic shrinkage cracks. Guidance there is to start curing early and cure at least 3 days (NRMCA).
So when can you walk or drive on it?
Honestly: it depends, and we won't give you an hour count that fits every pour. The mix, the temperature, the thickness and the load all change the answer. Walking on a walk usually comes before driving on a driveway, because a car puts far more load on the slab. Beyond that, the contractor knows what they poured. Ask for the walk time and the drive time in writing, and ask them to barricade or flag the slab.
One number people misuse: in cold weather NRMCA says to protect fresh concrete until it reaches 500 psi, about two days after placement (NRMCA). That is the freeze protection threshold, not a green light for foot or vehicle traffic. Cold slows everything. Read what temperature is too cold to pour if you are pouring in fall or winter.
What else to keep off a new slab
- Salt. NRMCA advises avoiding deicers on new concrete in its first winter if possible, and using clean sand instead. Afterward use moderate amounts, and never ammonium sulfate, ammonium nitrate or magnesium based salts (NRMCA).
- Extra water. Do not let anyone add water to the surface to make finishing easier. Poor finishing and insufficient curing are among the causes of surface scaling (NRMCA).
- Heavy loads early. Trucks, dumpsters and material pallets belong off the slab until your contractor clears it.
If you are pouring a driveway, see what drives the cost of a Chicago concrete driveway. Akats pours flatwork in Chicago, and our concrete team will give you the walk and drive times in writing. The concrete guide covers the rest.
Common questions
Concrete is still curing, and drying is not the goal. NRMCA says curing normally runs at least 3 to 7 days. Ask your contractor in writing when the slab can take foot traffic and when it can take a vehicle.
NRMCA advises avoiding deicers on new concrete in its first winter if possible and using clean sand. After that, use moderate amounts of sodium or calcium chloride, and never ammonium sulfate, ammonium nitrate or magnesium based salts.
Keep the slab moist as your contractor directs. Curing needs moisture, but in cold weather, when freezing is expected, NRMCA says to use moisture-retaining curing such as a compound, paper or plastic, not wet curing. Follow your contractor's instructions.
Sources
- National Ready Mixed Concrete Association: Concrete in Practice 11: Curing In-Place Concrete (PDF)
- National Ready Mixed Concrete Association: Concrete in Practice 5: Plastic Shrinkage Cracking (PDF)
- National Ready Mixed Concrete Association: Concrete in Practice 2: Scaling Concrete Surfaces (PDF)
- National Ready Mixed Concrete Association: Concrete in Practice 27: Cold Weather Concreting (PDF)
Facts last checked: October 7, 2026.
This article explains general rules and common situations in Chicago. It is not legal advice, and City rules change. For a specific property, check with the Chicago Department of Buildings or a licensed professional.