You can't bare root bulbs but when they are dormant....and they have to do that on their own time....you can't force it by refrigerating them for example.
I suggest you either make a holding bed or do the garden one area at a time....or enlist help and do it all in one day.
Linda C

Don't know about other bulbs, but daffs and tulips are easy to bareroot.
Now, when foliage is gone/almost gone, dig them out, wash soil out of the bulbs, let them dry in a shade for a day or two, cut remaining greenery if any and put them in a bucket/large pot filled with sand (dry peat, wood shavings are OK too). Keep in a coldest possible place indoor. DO NOT WATER untill planting time.
If indoor is not an option, cover the top of the bucket by cardboard or something to prevent rain water to get in.

Peony is a whole different story. If you bareroot them then you should forget about flowering for at least couple of years. If you have no other option as to move them now, cut 2/3 to 1/2 of the foliage, dig as large (both width and depth) rootball as you could and keep clump in a shade till you ready to plant. Water from time to time if out of the ground for longer than a week. Make sure to replant NO LOWER than it is right now. Actually, moving peony in late August is about the right time to do this, anyway.
I think it's also the right time for bearded irises as well.

Iris can be dug & left bare root for a few weeks with no problem. Daylilies can probably be done the same way, but personally, I would try potting them up & putting in the shade til you are ready for them. August is typically the time of year to move/divide peonies, so I think if you cut them back you could easily dig & leave bareroot for a week or 2. I would try to put them in the coolest area you can, at least in a shady area. All 3 of these are very hardy, really hard to kill, so you really shouldn't have any problems, although the iris & peonies may not all bloom in the spring, they should survive just fine.

Thanks so much for your input...I have one more question...When I dig them do I rinse the dirt from them (iris and daylilies) or do I leave the dirt on them? I can make them a sand box in the shade if this will help but I don't want to dig another bed since I'll working with well over a hundred bulbs...I'll certainly wait till end of august or would first of Sept be better?
Thanks again
lextra

Sorry to disagree....but if you dig peonys out of the ground and "bare root" them for a couple of weeks, when they are activly growing....you will be lucky to have them live, let alone bloom in 2 years.
Iris are tough guys, they probably would be OK and one or 2 of the rhizomes might put up a bloom stalk.
The rhizomes of the daylilys would probably shrivel up and die of left bare root for 2 or 3 weeks during the time when they are activly growing.
If you really must dig during August ( and if you are going to wait 2 or 3 weeks to plant, you really should get them in the ground in time to re establish before winter sets in..should plant by Sept 15th or maybe just a little later at the outside) dig the plants with as much soil around their roots as you can manage and put then in either pots, or a sand box as you say but fill it with top soil or sphagnum moss which you have gotten really damp before you put them there....or shredded wood mulch or bark or wood chips....something that will hold moisture.
This is the time of the year when plants are activly storing energy/carbohydrates in their roots to survive the winter and to put out growth next spring. Plants make energy through their leaves and sunlight ( photosynthesis....remember that from 9th grade?) and when you interrupt this process by cutting off the leaves or digging them up so they can't send water to the leaves and keep them green, you impair their abilty to survive the winter.
If the reason you are digging them is to amend the soil in the bed....you would be a lot better off just amending with the plants in place....do a sheet compost....or lots of top dressing for several springs. The worms will take the nutrients where you need it.
Linda C

Lextra,
Where in SE MO are you? I'm in So IL. I've dug up daylilies and just stuck the whole clump in a bucket of water and they did fine for quite a while. As far as the iris and such, I just dug a bunch of iris and put them in a dry box until I can get them all planted. I think they will be just fine. Don't panic--I think most of those plants are pretty hardy and--dare I say it--darn near impossible to kill!! Hey, if I've kept them alive this long...

I would use a proccess known as "heeling them in". Dig a trench in a shady part of your garden. As you dig up your plants cut the tops back to about 6 inches on the daylilies and Iris and about 50% on the Peonies. Lay the plants in the trench as you dig them with the tops exposed and throw soil on the roots. They will be OK for weeks and you can replant as time permits. Al

Great idea.....and they will likely live all winter like that....if it's necessary.
Linda C

Thanks a bunch! I'm going to try Calistogas suggestion of heeling them in and use the "trench" as the front of the new bed..I just hate duplication when it comes to digging around here since I'm dealing with red clay and rock. I figure if I don't get them all back in, I can finish it out in the spring when it's easier to dig. Again, thanks for the info.
lextra