Determining when to pick bell peppers depends on which variety you grew, but expect to wait 60-90 days to harvest. If you start the peppers from seed, they can take closer to 90-150 days to harvest.
Depending on the variety, bell peppers take 60-90 days to grow. If you plant nursery starts, most plants will take at least six weeks to produce a harvest. It will take longer if temperatures soar ...