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Though snails may be out at any time, they are primarily nocturnal. This is because snails are susceptible to drying out in direct sunlight. Most snails go out searching for food when it's dark out (or at least darker than usual), so that would be the best time to find one. If at all possible, try to go looking for snails in the evening or on dark, overcast days. Snails can live in many different places, but most terrestrial snails live in shaded, damp areas. If there isn't much shade available, many snails will burrow under hard objects that remain cool and damp away from direct sunlight. Some common snail habitats include: rocks debris flower pots wooden planks on the ground damp, shaded areas weedy or leafy areas close to the ground One telltale sign of a snail is the viscous, sticky trail of slime it leaves in its wake. If you're having a hard time spotting snails, you might have more luck if you search for their slime trails and follow a sticky streak to the snail itself. Slime is usually left in silvery streaks across dry surfaces. You might see a slime trail on rocks, dirt, pavement, or on vertical surfaces like trees and walls.
Search at the optimal time. Check common snail habitats. Look for a slime trail.