Terrain

Modifier

Soft or muddy ground

+4

Thick brush, vines or reeds

+3

Occasional signs of passage, dust

+2

Normal ground, wood floor

+0

Rocky ground or shallow water

-10

Every two creatures in the group

+1

Every 12 hours since trail was made

-1

Every hour of rain, snow or sleet

-5

Poor lighting (moon or startlight)

-6

Tracked party attempts to hide trail

-5