Now is the perfect time to put up a bird house. Certain birds like bluebirds, chickadees, wrens, titmice, nuthatches, and woodpeckers may begin to look for a place to nest as early as February, while there is still snow on the ground! Much better to be too early than too late.
Also small birds often use these same boxes for shelter at night and in bad weather during winter. Sometimes more than a dozen birds will pile into a single box to conserve heat.
You may want to offer Roosting pockets too. Wild Birds Unlimited, East Lansing has woven grass and felted wool pockets designed to prevent the birds' body heat from escaping, so unlike a nest box, it lacks ventilation holes. Also, its entrance hole is near the bottom so the rising warmth doesn't escape.
You can mount your houses on poles available at the store or on a fence post and hang roosting pockets from tree hooks in sheltered spots, out of prevailing winds. South-facing houses receive the most warmth from the winter sun.
Cute Winter Bird Houses! http://cute-winter-bird-houses.html
Roosting Pockets: Warm Shelter from Frosty Winds http://goo.gl/QOPbMw
Product Highlight: Solid Seed Cylinders http://goo.gl/HbISQR
Why Don't Birds Freeze After They Take a Bath in the Winter? http://goo.gl/5ydpvy
Poles to mount your Bird House http://poles-to-mount-house.html
Surviving Winter, the Bird Way http://goo.gl/SF0Yga