Gerbera is a tropical plant so I doubt the seeds would survive freezing.
I would store the seeds only in a 'frig ------ i.e. above freezing, but cool.
I want to edit this as I was sowing meconopsis paniculata at the time.
It will not take 3 months at 4ºC or 40ºF according to Dr. Deno.
The seeds die under those conditions. But those seeds would have been in MOIST paper towels.
If seeds are really dry they MAY take freezing.
Some of the world seed banks keep seeds frozen, but under low humidity.
Some seeds can not take freezing and moisture.
Some seeds can not take freezing even when dry.
Some seeds can not take dry storage either.
