Tomatoes & Peppers: Tomato mini-plants and hardening off???, 1 by BetNC

BetNC wrote:
My first time growing indoors from seed is more of a success than I bargained for!!

I sowed more than I need, figuring a learning curve and a low success rate (11 plants needed, 12 seedlings culled and 30 mini-plants still growing. . . . and growing!!). My planned plant out date is May 1, almost another 3 weeks away.

These mini-plants are short (about 6") and stocky, since they've been going outside beginning when they had their first leaves and it was warm-ish, almost daily now-a-days. Today, they stayed outside for six hours. . . tomorrow (weather permitting) they're scheduled for 8 hours!!! By next Saturday, they're scheduled to stay outside from dawn to dusk.

But how cold is too cold to let them outside?? I read (on the 'Net) that anything above 40 is fine.
And how much BIGGER will these get in these last 3 weeks?? (According to the schedule, they're to be fertilized next watering.)

Pic was today. . .