In one aspect, a system for monitoring the condition of seedbed within a field may include a plurality of ground-penetrating tools supported by an implement frame adjacent to its forward end. The system may also include a plurality of surface-finishing tools supported by the implement frame adjacent to its aft end. Moreover, the system may include a seedbed floor detection assembly coupled to the implement frame behind the plurality of ground-penetrating tools and in front of the plurality of surface-finishing tools. The seedbed floor detection assembly may include a seedbed tool configured to ride along the seedbed floor. Additionally, the seedbed detection assembly may include a seedbed floor sensor configured to detect a position of the seedbed tool relative to the implement frame, with such position being indicative of variations in a profile of the seedbed floor.