Normally plants that are put outside for spring/summer, are given a climatizing....i.e. put it out during daylight hours, back indoors at night; back outdoors when the day temperatures pose no problem, then back inside.
OUtside for longer periods each day but guard against frost. To that, a barrier to wind should be arranged..wind is the plant's nemesis cuz it can dry out the soil much faster than you might expect. Water to drainge, dump the excess and only fertilize when the plant is growing.
Consider the plight of the leaves if temperatures suggest a possible problem. Better to be safe and free of anxiety than to make spring come too soon and pay for your rush.

A cold frame is a great item to have... but if you don't have one, or don't have room for one, there are other options... I've seen some folks use sheets or other temporary covers... or as I do, just keep the flats or pots close enough to a building, so you can bring them in quickly.

Sometimes, you can find those little plastic pop-up greenhouses fairly cheap... I found some a few years ago at Lowe's, and I think I paid about $7 each, so I bought 4.

Gardening is a game of patience, to be sure. At this time of year, it pays to watch the weather forecast, and go through the motions of keeping your plants safe.