How to Install a Curtain Rod for an Arched Window? | Arch Guide

For arched windows, the simplest method is mounting a straight rod below the arch, while flexible curved rods can follow the arch’s shape for a custom fit.

If you’re wondering how to install a curtain rod for an arched window, the approach comes down to one choice: whether you want the curtain to hang below the arch or follow its curve. A straight rod mounted beneath the arch is the simpler route that works in nearly any home, while a flexible rod or track that matches the arch requires more planning but delivers a tailored look. Careful measuring and proper bracket support are the difference between a polished install and a sagging, crooked mess.

Straight Rod vs. Flexible Curved Rod: Which Works For Your Window?

A straight rod placed just below the arch — across the rectangular lower section — is the most common approach and works with standard curtain panels and standard hardware. A flexible curved rod or track follows the arch’s inner or outer curve but needs curtains that match that shape, often custom-made or sewn to fit.

For most standard residential arched windows — including those with a rectangular lower section and arched top — a straight rod below the arch is the practical default. If you want the curtain to trace the arch for a decorative effect, a flexible rod is the better route, but expect more time spent on measuring and curtain prep. If you’re still weighing options, our tested arched window curtain rod recommendations can help narrow the choice.

Measuring and Marking The Right Rod Height and Bracket Placement

Getting the height and bracket positions right prevents crooked hanging and weak support. Start by measuring the full window casing width, not just the arch. For a straight rod, add about 6 inches per side beyond the casing so curtains can stack back without blocking the glass. The rod itself should be 8 to 12 inches wider than the window for balanced coverage. If mounting a straight rod, place it about 4 to 6 inches above the top of the window frame; for arched windows specifically, mounting roughly halfway between the arch top and ceiling can make the room feel taller.

Mark bracket positions about 2 inches from each side of the window, then use a level to confirm they’re even before drilling. If the rod span exceeds 30 inches, plan for a center support bracket to prevent sagging over time. Check for wall studs with a stud finder; if no stud is available at your marks, drill a pilot hole and use a drywall anchor rated for the curtain weight. Home Depot’s curtain installation guide covers the full fastening details for typical wall types.

Installing a Curtain Rod for an Arched Window: Step-by-Step Hardware Guide

Once the measurements are locked in and you’ve chosen the rod type, the installation follows a consistent sequence. Mark the rod height with a pencil and verify level on both sides. Mark bracket locations about 2 inches from each side of the window and confirm alignment with a level. Locate studs with a stud finder; if none are present, drill pilot holes and insert drywall anchors. Install the brackets with screws. Thread curtains onto the rod or attach them with rings or clips. Set the rod into the brackets and adjust finials or holdbacks as needed. Use a stepladder and have an assistant steady it when working above head height.

Flexible curved rods may require additional support clips every 10 to 12 inches along the curve, though this varies by manufacturer — follow the included hardware guide. Confirm that the curtain attachment method — pocket, grommet, or rings and clips — matches the rod hardware before buying.