When

Third Monday Trade Days is held the Friday, Saturday and Sunday before the third Monday of each month. Hours are 8 a.m. to 5 p.m. all three days. Market Dates for the next year allow you to plan ahead for your visits to Third Monday. When you pay to park, you will also receive a business card with the market dates. Next market is April 12, 13, and 14, 2013
Where

Third Monday Trade Days is located 2 miles west of US75 on US380 (also known as University Drive). The physical address is 4550 W University Dr., McKinney TX 75071
What
Third Monday Trade Days in McKinney, Texas is the oldest and largest monthly trade days/flea market in North Texas with roots back to the old county-wide market that began in the 1870's in McKinney. It is located in the historic Buckner Community which was the first County Seat of Collin County.
Over 450 vendors offer almost anything you can imagine - unique gifts, delightful home decor, trendy clothing and accessories, sporting goods, antiques and collectibles, dogs, and specialty items along with many fantastic "state fair" type food concessions.
You'll find a mix of antiques, trendy apparel and accessories, baby and children's clothing and accessories, garage sale items, a great variety of home decor-- including shabby chic, re-purposed items, vintage, rustic, primitive, western, and seasonal-- metal art, pet supplies, garden/outdoor decor and furniture, health and beauty products, etc.
Third Monday Trade Days has 18 acres of parking, 2 ATMs, mobility cart rentals, clean, modern restrooms, 3 shopper entrances and exits, and a heated and air conditioned Mall.