Is cedar wood good to burn in fireplace?

Yes. Cedar is safe to burn in your fireplace, but be careful because it burns fast and hot. It also tends to pop like a bad guys joints in a Chuck Norris film.

I wanted to add to the first answer by telling everyone that not only can you burn cedar, I would highly recommend it. Cedar is an Excellent source for kindling (fire-starter), because it burns very hot. The down side is that it also burns very fast. This species is also extremely aromatic, vocal (lots of cracks and pops) and creates a warm glow. Next time your snuggling up with your partner, try starting a fire in your fireplace with some cedar. Once the cedar gets ripping, add some slower burning wood such as maple, oak, poplar, alder, etc. Add a little cedar occasionally to get the crackles going again.

Please don't rush out and cut down a cedar tree. Instead, find some dead fall or buy some at your local conglomerate hardware store. (Hint: split rail Fencing is often made of cedar and is awesome to split and burn)

Enjoy.