By the Sill Shade workroom team — bay windows are the job customers call us about most, and the one most people get wrong on the first try.
There are three ways to curtain a bay window, and only one of them works in most homes: a jointed rod that follows the bay around its corners, using elbow connectors at each angle. The other two — a single straight rod across the front of the bay, or separate rods on each window — are fallbacks for specific situations. Here is how to pick, measure, and mount each one.
The 3 Ways to Do It
| Method | How it works | Best when | Watch out for |
|---|---|---|---|
| 1. Jointed rod (bay rod) | Rod segments joined by adjustable elbows follow the bay wall around each corner | Almost every bay — this is the standard solution | Rings cannot pass the elbows, so plan where each panel stacks before you buy |
| 2. Three separate rods | One rod per window section, treated independently | Deep bays, or when you want each window to open on its own | Six panels instead of four; corners can look busy |
| 3. Straight rod across the front | A single rod mounted wall-to-wall, closing off the whole bay | Shallow bays; when you want the bay to read as one flat window at night | You lose the bay recess entirely when closed, and a window seat becomes unusable |
In the workroom we specify option 1 for roughly eight bays out of ten.
How to Mount a Jointed Bay Rod
- Measure each section separately. Take the width of the left angle, the front, and the right angle — wall corner to wall corner, at the height where the rod will sit. Do not measure the glass; measure the wall.
- Set the height. Same rule as any window: 4 to 6 inches above the frame, or halfway to the ceiling. In a bay, keep the rod perfectly level across all three sections — a bay exaggerates any tilt.
- Add extension at the two outer ends. Six to ten inches past the frame on each end so the outermost panels stack against the wall instead of over glass.
- Mount brackets at every corner plus each end. That is a minimum of four brackets; add a center support on any segment over 60 inches with lined fabric.
- Check the elbow angle before drilling. Most adjustable elbows cover 90 to 180 degrees. Standard bays are 135 degrees; older homes are often not. Dry-fit first.
How Many Panels, and Where They Stack
This is the part that trips people up. Curtain rings cannot slide past an elbow connector. Every segment of the rod is effectively its own track, so you decide up front where fabric lives.
The standard arrangement for a three-sided bay is four panels: one at each outer end, and one on each side of the front section. Opened, they stack at the four corners and leave all three windows clear. Closed, they meet in the middle of the front window.
If you want each window to open independently, go to six panels — a pair per section — and accept more fabric bunching at the corners.
Fullness math does not change: total panel width should be 2 to 2.5 times the total rod length across all segments. On a bay, that adds up fast, which is why bay windows are usually the most expensive window in the house to dress. Our measuring guide covers the width calculation in detail.
Length in a Bay: Floor or Sill?
Floor length if the bay is open below — it makes the whole bay read as one grand window and is what we recommend by default.
Sill or apron length if there is a window seat, a radiator, or a bench in the bay. Floor-length panels over a window seat are unusable: you either sit on them or fight them every time.
Whichever you choose, keep the hem line consistent across all three sections. Full size chart in our curtain lengths guide.
4 Bay Window Mistakes We Get Called In to Fix
- Buying a straight rod and hoping. A straight rod across a deep bay wastes the recess and blocks a window seat. Measure the projection before you decide.
- Forgetting rings cannot cross the elbows. People buy two long panels for a three-section bay, then discover the fabric will not travel. Four panels minimum.
- Not extending past the outer ends. Without extension the end panels sit over glass and the bay looks permanently half-closed.
- Skimping on brackets. A bay rod carries more weight over more spans than a straight rod. Bracket every corner and every long span.
If a Bay Rod Will Not Work
Some bays defeat rods — very deep projections, awkward angles, or trim that leaves no mounting surface. Two alternatives: ceiling-mounted track, which bends to any angle and gives the cleanest modern look, or blinds or shades inside each window with a single pair of stationary drapery panels framing the whole bay. The second is a favorite of ours: it gives real light control plus the softness of fabric without any cornering problems.
Renting and cannot drill? See the weight limits in our no-drill guide — tension rods can work in individual bay sections, though not around corners.
Bay Window Curtain FAQ
How many curtain panels do I need for a bay window?
Four for a standard three-sided bay: one at each outer end and one on each side of the front window. Six if you want every section to open independently.
Can you put one curtain rod across a bay window?
Yes, mounted straight across the front of the bay wall to wall. It works on shallow bays but closes off the recess and makes a window seat unusable.
How high should a bay window rod be?
4 to 6 inches above the window frame, or halfway between frame and ceiling — and dead level across all three sections.
Do curtain rings slide around bay rod corners?
No. Elbow connectors block them. Each rod segment holds its own panels, which is why you plan the panel layout before buying.
Should bay window curtains touch the floor?
Yes, unless there is a window seat, bench, or radiator in the bay — then use sill or apron length so the fabric stays usable.
More from the workroom: how to hang curtains · curtain lengths guide · types of curtains · all curtain guides