Nelson were beaten 3-0 at worthy champions Glossop North End on Saturday, before a depleted side fought back from two goals down to draw at Runcorn Town on Monday.
On Saturday, in front of a crowd of 914 at Surrey Street against the FA Vase finalists, the Blues played up the slope in the first half, against a strong wind.
But they got through to the interval intact.
Ben Woodhead was exposed by the hosts’ swift attacks a number of times, but the Admirals also threatened through Joe O’Neill, George Melling, Jonty Maulin and Paul Fildes.
Nelson had use of the slope after the break, but fell behind five minutes into the second half as a deep cross was headed home by Lee Blackshaw at the far post.
Nelson renewed their efforts, but found it hard to make progress against a side with 31 clean sheets.
Glossop substitute Mark Reed doubled their lead on 77 minutes, two minutes after being introduced, heading in from close range, and Blackshaw rounded off the scoring two minutes from time.
Then on Monday night, a Nelson side containing four development squad players fought back to draw 2-2 at Runcorn.
Paul Shanley gave Town a 13th-minute lead, and two minutes later Curtis Cummins made it 2-0.
But Matt O’Neill halved the deficit on the stroke of half-time, and brother Joe levelled matters just after the hour as the Blues claimed a share of the spoils.
Nelson round off their season tomorrow as they entertain 1874 Northwich at Little Wembley, with kick-off at 3 p.m.