Skill Check Difficulty Class

LevelEasyModerateHard
181219
291320
391321
4101421
5101522
6111523
7111623
8121624
9121725
10131826
11131927
12142028
13142029
14152129
15152230
16162231
17162331
18172332
19172433
20182534
21192635
22202736
23202737
24212837
25212938
26222939
27223039
28233040
29233141
30243242

Published in Dungeon Master's Guide, page(s) 42, Rules Compendium, page(s) 126.