How long after a hair transplant can I wear a hard hat?

It's great that you're planning ahead for your post-transplant care. After a hair transplant, protecting the newly transplanted grafts is crucial during the healing period. By the time you return to work two weeks after your procedure, your grafts should be relatively secure, but wearing a hard hat can still put some pressure on your scalp, which you want to avoid as much as possible during the early stages of healing.
In your case, since you only need to wear the hard hat for short periods, it should be fine after two weeks, but I recommend taking a few extra precautions to protect your scalp. One option is to wear a soft, breathable cap underneath the hard hat. This will help cushion your scalp, reduce friction, and protect the grafts from direct pressure. Make sure the cap is loose and doesn’t rub or irritate the transplanted area.
Additionally, ensure that the hard hat fits well and doesn’t press too tightly on the scalp. If you notice any discomfort or irritation after wearing the hat, it’s best to take it off and give your scalp some time to rest. Being cautious in the first few weeks post-transplant can make a big difference in your healing and final results.