| Situation | Concentration Check DC | 
| Cast defensively | 15 + double spell level | 
| Injured while casting | 10 + damage dealt + spell level | 
| Continuous damage while casting | 10 + 1/2 damage dealt + spell level | 
| Affected by a non-damaging spell while casting | DC of the spell + spell level | 
| Grappled or pinned while casting | 10 + grappler's CMB +  spell level | 
| Vigorous motion while casting | 10 + spell level | 
| Violent motion while casting | 15 + spell level | 
| Extremely violent motion while casting | 20 + spell level | 
| Wind with rain or sleet while casting | 5 + spell level | 
| Wind with hail and debris while casting | 10 + spell level | 
| Weather caused by spell | see spell | 
| Entangled while casting | 15  + spell level |