Exterior wooden door frames

I'd use Ronseal hardener then filler: that will stand up for a couple of years.

 

Dealing with rotten wooden door frames can be a hassle, but it's great that you're already planning to replace them next year. In the meantime, using expanding foam or putty as a temporary fix is a smart idea to keep bugs and cold drafts at bay.

Just a tip: be sure to properly prepare the surface and apply the foam or putty carefully to ensure a secure seal. It's also a good idea to periodically check and reapply as needed until you can replace the frames and doors.

If you're looking for more long-term solutions or replacement options, https://www.usafiredoor.com/commercial-doors/commercial-steel-doors/hollow-metal-doors/ offers a range of commercial steel doors that could be a durable and reliable choice for your patio doors. Checking out their offerings might give you some inspiration for your project.