Every year I vow I'm going to mark my daffodils so I can find them and divide them in the fall.
Actually they 'should' be dug about 6-8 weeks after the blooms have faded and the foliage has yellowed.

I often forget to mark them.
Been there...done that. I mark them in different ways depending on where they are planted. I have marked clumps with surveyors flags available at hardware stores. I've also used Flag Tape to wrap around the foliage at the base of a clump. You can also write on the tape...name of daff, how many blooms, description, etc.

When you dig them 6-8 weeks after bloom time, you can then either cure/dry and store them for late fall planting, or else plant them back right away. Previously I didn't advocate replanting right away, but have found that it is commonly done by numerous daff friends who are 'in the know'.

In your area I wouldn't plant until the soil temps have cooled a good bit, to about 50F-55F. I'm not sure when that would be, and it could differ from year to year. Planting time here in IN starts in Oct.
Sue

I'll have to see when the 6-8 week time period occurs. Maybe I'll have to dig and cure because usually I'm planting bulbs here the first half of November.

Thanks for your suggestions on things to use for markers. I did a little researching here on GW regarding markers. I had a good laugh when I found one person who used small pieces of old plastic window blind which made the daffodil groups look like mouse cemeteries. Broke me up. Can you just picture that??!
Thanks Sue.

Daffodils will start putting out a root system before winter!
In Sept. when I thought it was safe to dig ---- aughh, there were about 5 inches of roots already.

I'd dig as Chemocurl says --- 6-8 weeks after bloom and I'd have the holes dug for immediate transplant. The leaves may still be yellow but luckily daffs are the most forgiving bulb I've ever grown.