You haven't said just where you live......so if we're talking California or Florida, you may think its too late.
But its not....spring or summer is still a good time to plant seeds for zonal or other pelargoniums.

Geranium is not a plant to want to copy its parents...they are particularly unreliable in this way.
Martha Washingtons..(Regal geraniums) also do not lend themselves to good seed germination.