Yes—4x18-inch panorama frames do exist, so it’s worth searching specifically for “4x18 frame.” Another practical option is to buy frame components from a framing supplier: many metal frame systems are sold as pairs of sides, so you can order 4-inch and 18-inch sides plus matching glazing, backing, and matting cut to size.

If you want to use a mat, remember the outer frame must be larger than the print. For example, a 2-inch mat around a 4x18 print would need roughly an 8x22 frame.

A workaround is to use a frame designed for three 4x6 landscape photos and have a custom mount cut to suit your panoramic print.