I was digging a hole in the yard and when I returned it was full of snakes including a rattlesnake.
Dreaming about digging a hole and finding snakes in it, including a rattlesnake, can symbolize hidden fears, worries, or repressed emotions that you may have been trying to avoid. The yard or the ground you were digging represents your subconscious mind and the snakes may represent situations, problems or feelings that you may have been trying to bury or keep hidden. The rattlesnake specifically may represent a danger or threat from these hidden fears or emotions.
This dream may be a sign that you need to confront and address these fears or emotions that you have been suppressing. It could also be a warning to be cautious of the dangers that may arise from ignoring or avoiding them.