Generally 5 mph but you should always check the particular parking area for the posted speed limit.
There is no law governing speed in Minnesota parking lots.
School Zone, Residential area, Parking Lot, Park
10 mph
10 mph
15 mph
15 mph
A motorist is expected not to drive faster than the speed limit on the sign until the school has been passed.
25
When it is flashing the speed posted is the limit
By pararelle parking, regular parking, driving speed limit, driving curves, up hill, and focus
Whatever the normal posted speed limit of the road is.