Concrete Curing Time Calculator
Calculate concrete curing time based on temperature and mix type. Know exactly when it's safe to walk or drive on your new slab.
Pour Conditions
Estimated Curing Timeline
Understanding Concrete Curing Times
Unlike paint, concrete doesn't "dry" by evaporation. It hardens through a chemical reaction called hydration. This exothermic reaction requires the presence of moisture and is heavily dependent on ambient temperature.
When temperatures dip below 50°F, the hydration process slows down significantly, doubling your wait times. Conversely, pouring in hot summer weather above 90°F will cause the concrete to set rapidly, which risks "flash setting" and shrinkage cracks if the surface isn't kept continually wet.
The 28-Day Curing Cycle
| Time Passed | Strength Attained | What is Safe to Do? |
|---|---|---|
| 24 to 48 Hours | ~15% to 20% | Light foot traffic, formwork removal |
| 7 Days | ~70% | Standard passenger vehicles |
| 14 Days | ~85% | Medium trucks, lawnmowers |
| 28 Days | 99% (Full Design) | Heavy machinery, RVs, commercial use |
Frequently Asked Questions
How long until I can walk on new concrete?
You should wait at least 24 hours before walking on newly poured concrete. Keep pets and children off for 48 hours to prevent accidental scuffing or scratching of the finish.
How long until I can drive on a new concrete driveway?
You must wait at least 7 days before driving a standard passenger car on a new concrete driveway. For heavy vehicles like RVs or large trucks, wait the full 28-day curing period.
Does concrete ever fully cure?
Concrete reaches 99% of its design strength in 28 days. However, the chemical hydration process continues for decades. Technically, concrete gets slightly stronger every year for the rest of its life.
Should I water my concrete while it cures?
Yes, 'wet curing' is highly recommended. Spraying your concrete with a light mist of water 2-3 times a day for the first 3 to 7 days prevents the moisture inside from evaporating too quickly, which reduces surface cracking.