How long after pouring should I wait before driving on a new concrete driveway in NB's spring season?

Wait a minimum of 7 days before driving a passenger vehicle on a new concrete driveway, and ideally 28 days before allowing heavy vehicles like trucks, RVs, or loaded trailers.

Concrete does not dry — it cures through a chemical reaction called hydration, and that reaction takes time to develop the strength needed to support vehicle loads. A freshly poured driveway reaches roughly 50-70% of its design strength in the first 7 days, and the full 28-day design strength (typically 25-32 MPa for an NB driveway) by the end of the first month. Walking on the surface is generally safe after 24-48 hours, but vehicle traffic is a different matter entirely.

Spring Timing Makes This Even More Critical

Pouring in spring — May or early June — is actually ideal timing in NB, but the spring season introduces one important variable: ground temperature. Even when air temperatures are comfortably above 10°C, the soil and the concrete slab itself may still be cold from winter. Cold concrete cures more slowly than concrete poured in July or August. A slab poured in early May in Fredericton or Bathurst might take 10-14 days to reach the strength that a mid-July pour achieves in 7 days. If your contractor poured on a cool spring day with overnight temperatures still dipping toward 5-7°C, err on the longer end of the waiting window.

Spring also brings the tail end of NB's frost season. If there is any risk of a late frost — not uncommon in northern NB through mid-May — the contractor should have used insulating blankets to protect the fresh slab. Concrete that freezes before reaching approximately 3.5 MPa (roughly 500 PSI, which takes 24-48 hours under good conditions) suffers permanent strength loss that no amount of additional curing time will fix.

The 28-Day Rule for Heavy Loads

The 7-day minimum applies to standard passenger vehicles — a sedan or small SUV. For anything heavier, the 28-day mark is the responsible threshold. This means no delivery trucks backing up to your garage, no loaded pickup trucks, and especially no concrete trucks, oil delivery vehicles, or moving vans on the new slab until a full month has passed. The edges and corners of a driveway are the most vulnerable — avoid driving right to the edge for the first several weeks, as the unsupported perimeter cracks far more easily than the centre of the slab.

What to Watch For

A properly mixed, placed, and cured NB driveway — air-entrained mix at 25-32 MPa, 5-6 inches thick, with wire mesh or rebar, and a quality penetrating sealer applied after 30 days — should give you 25-40 years of service. If your contractor rushed the finishing, added water to the mix on-site to make it easier to work, or skipped the air entrainment, no amount of careful curing will fully compensate for those errors. Ask your contractor what mix was used and what the air content was — a professional will know immediately.

One more spring-specific note: do not apply any de-icing salt or chemical ice melter to new concrete during its first winter, regardless of how long you waited before driving on it. New concrete is especially vulnerable to salt damage in the first 12 months. Use sand for traction through that first NB winter, then apply a penetrating silane/siloxane sealer in the spring before the second winter season.

Need help finding a professional concrete contractor for your driveway project? New Brunswick Concrete can match you with local contractors for free — browse the directory at newbrunswickconstructionnetwork.com/directory?trade=concrete.