The light freeze occurs at 32°F to 29°F and doesn’t cause significant harm to your garden. Delicate vegetation like crops might suffer some damage. Of course, you need to protect your plants; bring the potted ones indoors, but the hardy plants will manage outside just as well.
The hard freeze happens when temperatures fall below 28 and stay in the low twenties for over 2 or 4 hours. The hard freeze, unlike the frost, it’s extremely damaging and can kill off a significant part of the vegetation in your garden.