Glamorgan batted placidly through the final day between showers at Leicester to reach 157-4, 201 runs ahead, as the match fizzled out into a tame draw.
Only Ben Mike (2-29) looked likely to give Leicestershire a chance of earning a run chase.
Sam Northeast (41 not out) top-scored for Glamorgan in a match that produced slow run rates after the first day.
Resuming on 14-1, 58 ahead, they could not make quick enough progress to force a positive result.
Leicestershire end the first half of the Championship campaign with seven draws, while previous draw kings Glamorgan have one win and one loss to go with five draws.
Rain interruptions again dogged proceedings, as Glamorgan lost Eddie Byrom leg-before to Scott Currie for 30 and Marnus Labuschagne, who was bowled for 30 with Mike’s second delivery nipping back.
Despite a general lack of bounce, the fiery Mike generated enough pace to discomfort Kiran Carlson after lunch, hitting him painfully then hitting his stumps.
Northeast and Chris Cooke (37 not out) saw the visitors safely through until rain returned early in the final session, midway through Australia batter Marcus Harris’s first over for the county.
The two teams now turn to the T20 Blast with Leicestershire hosting Yorkshire on Friday 31 May while Glamorgan entertain Surrey.
