The answer is YES. You can leave the indoor/outdoor rug outside.
The best outdoor rugs are made from high-quality, durable materials like
polypropylene that are waterproof and resistant to stains, mold, and mildew.
An indoor/outdoor rug can be put down in the park for a picnic, or it can be at
the back door to wipe your feet and prevent dirt and dust from coming inside
but the uses are endless.
Indoor/Outdoor rugs are used for introducing an aesthetic look to areas initially
under severe conditions; like covering up a dirty old floor. While indoor rugs
are used basically for adding a little touch to our homes since the interior of
many homes is always in good shape.