Forty-three and going strong.

Saturday, JFK 50-Miler, Boonsboro, 7 a.m., (301) 790-3958.

Saturday, BRRC A Place for Your Pace, Loch Raven, 8 a.m., (410) 323-7866.

Saturday, Jingle Bell Run for Fun 5K, Centreville, 9 a.m., (410) 758-1580.

Sunday, Great Dundalk 10K, Dundalk CC, 8 a.m., (410) 285-9690.

Sunday, Blue Jay Biathlon (3 run, 500-yard swim), Johns Hopkins

University, 8 a.m., (410) 882-6103.

Sunday, Greater Homewood 8K, Memorial Stadium, 9 a.m., (410) 323-7866.

Sunday, Steve Duckworth Memorial Team Biathlon, 2 p.m., (410) 875-4211.

Nov. 26, 5K Turkey Trot, Anne Arundel CC, 11:30 a.m., (410) 541-2756.

Nov. 28, RASAC Turkey Trot 4-Miler, White Marsh Shopping Center, 9 a.m.

*number not in service*

Nov. 30, Maryland Masters Track Club Fall Classic 1.5- and 3-mile Cross Country Races, Catonsville Senior HS, 9 a.m., (410) 744-2652.

Nov. 30, Northern Central Trails Marathon, Sparks, 10 a.m., (410) 494-8649.

Nov. 30, Turkey Burnoff, 5, 10 miles, Gaithersburg, 10 a.m., (301) 353-0200.

Dec. 1, HCS Metric Marathon (16.3 miles), Columbia, 8 a.m., (301) 992-5800.

Dec. 1, Annapolis Striders' Cold Turkey 20K, Edgewater, 10 a.m., (301) 268-1165.

Dec. 1, WRRC Frozen Finger 4-Mile Run, Westminster, noon, (301) 848-8332.

Dec. 1, Tri-Maryland Winter Biathlon (10 cross country ski, 15K mountain bike), Cumberland, (301) 882-6103.

Dec. 7, Sri Chinmoy 2-mile fun run, Patterson Park, 8 a.m., (410) 467-3223.

Dec. 8, Jingle Bell Run for Arthritis 8K, Hunt Valley, 8:30 a.m., (410) 494-8649.

Dec. 8, BRRC 6-mile cross country championship, Herring Run Park, 9 a.m., (410) 323-7866.

Dec. 8, RASAC Charity Run 5K, Harford Mall, 9 a.m.

Dec. 8, Jingle Bell Run for Arthritis 5K, Cumberland, 11 a.m., (301) 264-3178.