I want to fish more swim baits, so what is the best time or season to fish them. Pre spawn.spawn,post spawn,or summer,fall? I bought some of them hallow body swimbaits.

I think that the best time to fish the hollow body swimbaits is probably when bass are actively feeding in shallower water.  I have about 5 different brands of them and couldn't buy a strike, so my advice isn't worth 2 cents lol

I bought some 4.5" hollow body paddle tails for the first time just last week.  Asked the local pro at the shop all about them took them to the lake and had some success.  It is all about how fast and deep you want to fish them.  What worked for me was heavier weight slow retrieve for deeper water.  Unless the fish are really active I hate to see my bait the whole retrieve it means the bass can definately see you.  I fish very very clear water.  Light weight on these baits and they are very very shallow runners.  This being said I just bought several more with a wide variety of hook weights (they are now officially a part of my arsenal after holding out(now there are a TON of people making these and there are some fantastic colors and sizes out there, they are a viable option especially when they are hitting spinnerbaits)- I like the wighted extra wide gap hooks with the spring to screw into the head of the bait.  A lot of guys use to small hooks and you will have a hard time knowing you are getting bit on this bait if you don't acutally hook the fish, the bite is very different sometimes its a "push sensation".  One thing about this bait is it can excell anytime you are fishing when you would normally use a spinnerbait.

I use a weighted hook and slow yo-yo like retrieve.  Reel, pause, slight tug, reel, repeat.

The bass wack them pretty good on the fall.

Not all brands fall the same on the pause, you'll need to try a few and see what works.  Some drop like a rock, other actuall swim down.

Thanks for your input, I have a tournament this Sun. so I may give them a shot.  I will pre fish Sat., the bass are post spawn and some still spawning.