As snowmaking efforts continue in the county, the lack of natural snow doesn't appear to be preventing most Summit County ski areas from opening new terrain as Thanksgiving weekend nears.Keystone has the lead in the county for the most terrain open to skiers and riders this weekend, with a total of 122 acres.The resort will add acreage on Schoolmarm, a beginner trail, as well as portions of the Silver Spoon and Jay Bird trails. Six trails, including a terrain park with more than 25 features, and five lifts will be open for the upcoming weekend at Keystone.The resort is expecting to open its tubing hill and night skiing operations Wednesday to kick off Thanksgiving weekend.Breckenridge Ski Resort opened the middle Four O'Clock run Thursday and the 5-Chair opens today at 9 a.m. offering beginner access from the Vista Haus to Rip's Ride. In total, the resort is running the 5-Chair, Colorado SuperChair, and Rip's Ride accessing 75 acres. At Copper Mountain, snowmaking crews managed to open Green Acres with access from the Pitchfork Lift, 7 trails and 79 acres for today.Arapahoe Basin has not been able to open additional terrain. The ski area currently offers two intermediate trails, High Noon and Ramrod with 20 acres of skiable terrain as well as the High Divide terrain park. Though snowmaking is slow, operations are working to open new terrain, according to ski area officials."The fan guns are pointing at the lean spots," said Alan Henceroth, chief operating officer of the ski area. "We are still trying to get Lenawee Lift open by the weekend."Ski area officials from A-Basin announced Thursday afternoon plans to open new terrain Saturday, allowing guests to ski from the summit to the base area. Thanks to recent natural snowfall and low temperatures conducive to snowmaking, ski area officials say, A-Basin will open two more intermediate runs: Lenawee Face and Dercum's Gulch. The runs are serviced by the Black Mountain Express and Lenawee Mountain lifts and begin at the summit and connect at mid-mountain with High Noon and Ramrod. On Saturday, the Black Mountain Express Lift will open at 8:30 a.m. and end service at 4 p.m. The Lenawee Mountain Lift at mid-mountain and the Pika Place carpet in the base area will carry passengers from 9 a.m. to 3:30 p.m. Loveland Ski area opened additional terrain and Chair 6 Tuesday. So far, Loveland has reported more snowfall than Summit County resorts with 17-inches of natural snow to date.