by Quick answer: Most new mattresses need a few hours to a few days to air out. The "new mattress" smell, called off-gassing, usually fades within 24 to 72 hours in a well-ventilated room. All-foam beds take longer than coil hybrids and innersprings.
By the MattressNut editorial team · Updated June 2026
Airing Out a New Mattress — The Short Answer
The smell from a new mattress is off-gassing — harmless volatile compounds released as fresh foam expands. It's strongest with boxed, compressed foam and fades fastest with airflow. Unbox in a ventilated room, open windows, and most of the odor is gone in one to three days.
What to Know
| Step / Factor | Detail |
|---|---|
| Typical timeline | A few hours to a few days. Most off-gassing clears within 24-72 hours; faint smells can linger up to a week. |
| Material matters | All-foam and memory foam off-gas most. Coil and innerspring hybrids have far less foam, so they air out faster. |
| Ventilate well | Open windows, run a fan, or use the AC. Moving air carries the smell away much faster than a closed room. |
| Give it space | Leave the mattress uncovered (no sheets) while it expands and airs. Warmth and airflow both speed the process. |
Practical Tips
Unbox the mattress as soon as it arrives so it can expand and breathe. If the smell bothers you, sprinkle baking soda on the surface, leave it a few hours, then vacuum it off. Off-gassing odor is normal and temporary — but if a strong smell persists well beyond a week, contact the manufacturer.
Our Recommendation
If a long off-gassing wait puts you off, a coil-on-coil hybrid is a smart pick — far less foam means far less smell, and it arrives ready to sleep on much sooner. The Saatva Classic is delivered fully expanded by white-glove service, so there's no boxed-foam decompression or strong chemical smell to wait out.
See the Saatva Classic and its 365-night trial
The Bottom Line
Plan for a few hours to a few days. Ventilate the room, leave the mattress uncovered, and the off-gassing smell clears on its own. Foam beds simply take a bit longer than coil hybrids.
Bottom line: Air out a new mattress 24-72 hours in a ventilated room; foam takes longer than coil hybrids.
Related: our full Saatva mattress review.