Do blackout curtains actually block 100% of light?

True blackout curtains block 99%+ of light through the fabric itself. Light still enters around gaps at the sides and top — using curtain clips, velcro tape, or a tension rod behind the curtain eliminates these edge leaks.

Do blackout curtains reduce noise?

Somewhat — thick triple-weave fabric absorbs some sound energy. They're not acoustic panels, but most users notice a meaningful reduction in outside noise, especially from street traffic.

Will blackout curtains keep my room cooler?

Yes. Blackout curtains with thermal lining reflect sunlight and significantly reduce solar heat gain. Studies show room temperatures can be 10–15°F cooler with curtains drawn on a sunny day.

Best Blackout Curtains of 2026

True blackout curtains do two things: block light completely and provide thermal insulation that keeps rooms cooler in summer and warmer in winter. Inferior curtains marketed as 'blackout' still let in noticeable light around the edges.

These are the best blackout curtains in 2026 — evaluated on light-blocking performance, thermal efficiency, wrinkle resistance, and long-term durability.

What to Look For

Light Blocking: True blackout fabric blocks 99%+ of light. Room-darkening fabric blocks 85–95%. If you need pitch-dark, specify 'triple weave' or 100% blackout construction.
Panel Width: For full coverage, panels should be 2–2.5× the width of your window. Wider panels create better light seal and a more luxurious drape.
Length: Measure from rod to floor. Panels that puddle slightly at the floor seal better at the bottom gap.
Thermal Insulation: Thick triple-weave fabric reduces heat transfer noticeably. This lowers both cooling and heating costs year-round.
Care Instructions: Machine-washable curtains save significant hassle. Check that the fabric won't shrink after washing — some blackout linings are dry-clean only.

Our Top Picks

#1 Best Overall

NICETOWN Blackout Curtains 2-Panel Set

Triple-weave fabric with 99% light blocking, thermal insulation, and noise reduction. Machine washable, wrinkle-resistant, and available in 35+ colors and 14 size options.

~$35 View on Amazon →

#2 Best Grommet Top

BGment Room Darkening Curtains with Liner

Detachable blackout liner sewn to back of the main curtain — adds both light blocking and thermal performance. Grommet top slides smoothly on any standard rod.

~$30 View on Amazon →

#3 Best Thermal

Deconovo Blackout Curtains Silver Coating

Silver thermal coating on the back reflects sunlight and significantly reduces heat gain in summer — measured up to 33% room temperature reduction in direct sunlight.

~$40 View on Amazon →

#4 Best Budget

Eclipse Blackout Curtains Rod Pocket

Thermaback lining blocks up to 99% of light with a classic rod-pocket style. Budget-friendly and widely available — a solid starter blackout curtain.

~$20 View on Amazon →

Bottom Line

NICETOWN remains the best-value true blackout curtain — excellent light blocking, multiple size options, and machine washable. For the best thermal performance, the Deconovo Silver Coating model is worth the upgrade.