Can I put any weight on my foot if I have a heel fracture?

Heel fracture. If you have a true calcaneal fracture (heel fracture). You should be non weight earring for 6-8 weeks in a below the knee fiberglass cast.
No. If you have a calcaneus fracture (a "heel bone" fracture), generally, that requires at least 8 to 12 weeks of non weight bearing to allow sufficient time to healing. Otherwise, the fracture is likely to displace. Some calcaneus fractures require surgery to prevent arthritis. Make sure you seen an orthopaedic surgeon to make sure your fracture is being treated appropriately!