It's tempting to park on a fresh driveway as soon as it's hard, but concrete hardens long before it's strong. Driving too early is one of the most common ways to crack a brand-new slab.
The rule of thumb
Passenger vehicles: seven days is a common residential waiting period for conventional concrete, but it is not a guarantee. Ask the installer when the specific mix and slab can take traffic.
Heavy vehicles: wait for the installer or engineer to confirm the slab has sufficient strength and support. A 28-day strength test age is not proof that every driveway can carry a loaded truck or dumpster.
Why the wait
Concrete gains strength on a curve: fast at first, then more slowly. At 24 hours it may be walkable but is still gaining strength. Putting thousands of pounds on a point load too soon causes cracks that no amount of later curing will undo.
Cold weather extends everything
Curing slows dramatically in the cold: below about 50°F the strength clock crawls, so a slab poured in late fall may need extra days before it's ready for traffic. When in doubt, wait longer or ask the crew who poured it.
Common questions
Can I drive on concrete after 3 days?
Do not assume it is ready. Strength depends on the mix, curing and weather; ask the installer before using the driveway.
How long before parking a heavy truck on new concrete?
Ask the installer or engineer to confirm the slab is designed and strong enough for the load. Time alone does not establish capacity.
How thick should a driveway be to support vehicles?
5 to 6 inches for residential driveways. See our guide on concrete slab thickness.