Tomatoes and peppers, provided you keep the seedlings from croaking in any hot days in the next few weeks should be fine--though you may not have fruit as early as your neighbors.

Pumpkins I have no idea about; never grown 'em.

For future reference, your tomatoes and peppers depending on the type of peppers... I start around the middle/early of march. If they are hotter varieties of peppers (my extremely hot peppers I start late december or early january. You could try now but it's extremely late in the year to be planting from seed in regards for peppers and tomatoes.

If you're wanting to plant something now, you may be better off getting plants. You can try, but expect a very late harvest.

I can't tell you anything about pumpkins.

From just west of the knoxville area here.

I know im a little late with this, but i try to plant my pumpkins this first two weeks of june. That way their ready the first of oct. I direct sow mine.