Ultra™ Series | C650 Fiberglass Windows

Beautiful and contemporary, these fiberglass windows are strong and built to last. Create the home of your dreams.

Modern Design.
Stunning Visual Impact.

Ultra™ Series C650 is our contemporary premium fiberglass window and patio door line that is strong and built to last. The fiberglass material resists swelling, rotting, and warping making it the perfect choice for long-lasting durability coupled with exceptional beauty.

Awarded Most Used and Most Recognized window brand in the Western United States*, Ultra Series offers high performing and energy efficient windows and patio doors for an upscale look that can complement any home.


  • Fiberglass frames are resistant to temperature fluctuations making them a durable, low maintenance choice
  • Window hardware is attractive, secure and easy to operate
  • A selection of exterior frame colors to enhance the look of your home
  • Matching interior and exterior frames in Black Bean or Bark to create the popular dark window look
  • Backed by Milgard's Warranty

Single Hung
Positive Action™ Lock, Cam Lock, Sash Pull

Folding Nesting Operator, Sash Lock

Folding Nesting Operator, Sash Lock

Horizontal Slider
Positive Action Lock, Cam Lock, Sash Pull

Picture and Radius

Dependent on your window selection

Details That Matter

Exceptionally Strong

The strength of fiberglass protects your investment from the elements in all seasons. Because of its inherent properties, fiberglass won’t swell like wood and it expands and contacts at the same minimal rate as the glass it holds for improved energy efficiency.

Fiberglass won’t crack, peel, warp, split, pit or corrode and is virtually impervious to water. Milgard regularly tests its fiberglass lineals for color uniformity, gloss, film thickness and chemical resistance for quality and long-lasting performance you can count on.

Installation Configurations

Make it Your Own

Express your creativity and dramatically increase your home’s curb appeal with our grid options. Select grid choices placed inside our insulated glass units for easiest window cleaning.

Decorative Glass
For rooms, such as the bathroom, we offer obscure glass for privacy or decorative flair. We also have tinted glass for additional shading from direct sunlight. 

Make a Statement with Color

Work Gallery

Free In-Home Estimate Call 1-949-284-7483

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