I am just getting my first hammock, i see a lot of talk about under quilts but i will never be camping when the temps get below 50 probably. If i am only camping in the June, July, and August time would i be fine if i had something like a Kelty bestie blanket under me including my sleeping bag?

Maybe, but probably not. You compress all the insulation when you lay on it. I would just get a cheap 40 or 50 degree under quilt.

I'd STRONGLY suggest at least a light underquilt - 35 degrees perhaps. You can always loosen the head and foot to allow air to flow through between it and your bottom side. Even the low 50s will seem arctic in time without it.

ParkerMag: "I'd STRONGLY suggest at least a light underquilt - 35 degrees perhaps. You can always loosen the head and foot to allow air to flow through between it and your bottom side. Even the low 50s will seem arctic in time without it."

^^ This ^^ < 70 deg w/ a breeze and you'll have cold but syndrome in the night.
I use a 30deg in the summer and vent it if needed (40 would be perfect in the warmest months you mention)... or take that lower heat and forego top insulation until I get chilled at night.
An easy way to force ventilation is to throw a shoe or water bottle into the UQ -- pulls it away from the body and opens a little gap at the end. Can also try synching up the end channels or putting an extender on the primary suspension.

As you know, it can get chilling in especially June and Aug in the BWCA

I've been camping lately here with night temps in mid 50's to 60 and the 30 deg is not too warm. It also gets me down to 30 w/o problems, then time to switch to a warmer U-quilt.

ParkerMag: "I'd STRONGLY suggest at least a light underquilt - 35 degrees perhaps. You can always loosen the head and foot to allow air to flow through between it and your bottom side. Even the low 50s will seem arctic in time without it."

+2 completely agree with ParkerMag and Us5Camp’s recommendation. You could also use an air mattress for insulation but a light under quilt is my first choice.

I have one of these and I use it into the shoulder seasons. A nice starter underquilt.

In hammock camping there's a thing called CBS (Cold Butt Syndrome). The air below your hammock chills you much more so than say laying on the ground in a tent. Anything below the high sixties and after a while one gets a cold back/butt, so it's imperative that you have some kind of insulation under you. If that insulation is compressed it will lose it's ability to insulate, so most folks who hammock camp eventually purchase an underquilt that is suspended immediately below the hammock and thus remains uncompressed. Down is favored as it is lighter, compresses better and is usually more efficient compared to a synthetic insulation. Quality hammock quilts are produced by a number of excellent cottage vendors like Enlightened Equipment , Underground Quilts and Hammock Gear.
If you are looking for a reasonably priced high quality down top quilt or underquilt I would recommend Hammock Gear's Econ quilts. Personally I would do a 20 degree Econ Incubator underquilt and a 30 degree Econ Burrow top quilt if it were me. These temps work well in the BWCAW for the summer as well as the shoulder seasons.

Another voice for something that does not compress and insulates big enough you will not hang over the edge. A good sleeping pad can do the job, but cold elbow comes to mind. I also experience no overheating with the UQ and on really hot nights loosening it to create an airflow gap will do the trick. While a pad will satisfy, the UQ will gratify.