Short answer
Concrete is dry enough to walk on after 24 to 48 hours, can usually take passenger cars after about 7 days, and reaches its full design strength at about 28 days. It cures best between 50 and 85°F. Below 50°F curing slows, and below 40°F it virtually stops.
| Walk on it | after 24–48 hours[1] |
|---|---|
| Drive a car on it | after about 7 days[1] |
| Full cure / design strength | about 28 days[1] |
| Ideal temperature | 50–85°F[1] |
| Below 40°F | hydration virtually stops[1] |
| 7 days moist-cured vs. uncured | about 50% stronger[1] |
Curing vs. drying
Concrete doesn't harden by drying out. It hardens through hydration, a chemical reaction between cement and water. The American Cement Association puts it simply: curing "ensures the continued hydration of the cement so that the concrete continues to gain strength after placing", and most of that strength gain happens in the first month. That's why keeping new concrete moist and within a good temperature range matters. If it dries too fast, it ends up weaker and more prone to cracking.
Timeline for a new patio or driveway
- Day 1–2: forms can come off and foot traffic is okay.
- About day 7: light vehicles are typically safe.
- About day 28: the concrete reaches its design strength.
Pouring concrete in cold weather
Concrete cures best between 50 and 85°F. Below 50°F hydration slows, and below 40°F it virtually stops, so concrete poured in the cold gains strength slowly and can be damaged if it freezes early. Contractors pouring in cold weather protect new concrete with insulating blankets or heated enclosures and plan for a longer curing time before traffic. If a cold snap is forecast, ask your contractor how they'll protect the pour or whether to reschedule.
Weather in Washington
West of the Cascades, rain is the usual problem, so plan for covering the pour. East of the Cascades, cold snaps matter more. Below 50°F curing slows down, and pours in cold weather need blankets or heated enclosures. A licensed contractor will plan around both. Get quotes or browse contractors in Washington.
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Frequently asked questions
Can it rain on new concrete?
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Rain on a fresh, unfinished surface can damage the finish, so contractors cover new pours or reschedule. Once the concrete has set, moisture actually helps curing. Ask your contractor how they protect a pour if rain is forecast.
When can I park a truck or RV on a new driveway?
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Passenger cars are typically fine after about 7 days. Heavier vehicles should wait longer, closer to the full 28-day strength, so ask your contractor for a date based on your mix and slab thickness.
Do I need to water new concrete?
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Keeping concrete moist in the first days improves strength. Concrete moist-cured for 7 days is about 50% stronger than uncured concrete. Contractors use water, wet coverings, plastic sheeting or a spray-on curing compound.
Sources
- [1]ConcreteNetwork.com, Curing Concrete (updated May 6, 2025)
- [2]American Cement Association (formerly Portland Cement Association), Curing in Construction (checked October 5, 2026)
Prices are national ranges published by the sources above, not quotes. Your price depends on size, access, site preparation and local labor rates. The only way to know is to compare written quotes.