Slopes in some mountains may be greening up by late spring, but if you're itching for turns, you can still get them at several North American ski resorts. Be sure to check first, but here are five resorts you can check out for skiing and riding in July.

Most of the available terrain is geared for those with intermediate and advanced skills. Hours of operation and scheduled lifts may change on some days at some resorts; weather or snow conditions can force lift closures or alteration of the hours. If you're driving a long distance, be prepared to be flexible.

[R470R, Timberline Lodge], Ore., a mainstay for summer skiing, runs the longest season. The resort grooms lanes across Palmer Snowfield above treeline on Mt. Hood for their summer race camps, but always makes at least one lane available for the public. A terrain park is maintained on Otto Lang. Magic Mile and Palmer lifts open daily through Sept. 6. Hours usually are 7 a.m. - 1:30 p.m., and lift tickets cost $54.

Horstman Glacier transforms in summer to a ski and snowboard slope at [R493R, Whistler Blackcomb], B.C. The Blackcomb Mountain glacier maintains terrain park features, mogul fields, groomed slopes, and serves up lunch at Horstman Hut for the summer ski season, which lasts through July 25. To get to the glacier requires riding three chairlifts and catching a shuttle bus. Two T-bars on the glacier run daily noon to 3 p.m. Skiers and riders can begin uploading from the base at 11 a.m. Adult tickets cost $55.

[R227R, Mammoth Mountain], Calif, continues to open for skiing daily through July 5. Broadway Express, Facelift, and Chair 23 open from 7:30 a.m. to 1 p.m. with one terrain park and a fistful of groomed runs. The ski season finishes with the Last Run of the Season Party Monday afternoon at The Yodler. Adult lift tickets cost $69. Other portions of the resort are open concurrent with skiing for lift-accessed mountain biking and golf; you can do all three in the same day for $99.

Two California resorts sometimes take advantage of their big snow years by re-opening for weekends. [R201R, Kirkwood Mountain Resort], Calif, opened for the July 4 weekend in 2010. [R67R, Boreal], Calif,  re-opened for a July weekend in 2010 for the July Shred Fest. T

More information: Timberline Lodge, 503-272-3158; Whistler Blackcomb, 888-403-4727; Mammoth Mountain, 800-MAMMOTH; Kirkwood, 209-258-6000; Boreal, 530-426-3666.