Our first freeze warning

This seems too early in the seaon, but yes, it's cold out! It's hovering right at 32F.

I brought in all my succulents two days ago. Last night after class I brought in a few more citrus but left the bigger pots outside. I hope they are OK. It didn't dip into the 20s so I took a risk.

I have two tomato plants I brought inside, the only two plants that were productive at all. The ones with infected fruit I left to freeze. Too many tomatoes from most plants would go from green to rotten.
...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM MST THIS MORNING......FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM MST FRIDAY...THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A FREEZEWARNING...WHICH IS IN EFFECT FROM 1 AM TO 9 AM MST FRIDAY. AFREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM MST THIS MORNING.CLEAR SKIES...LIGHT WINDS AND A VERY DRY AIR MASS WILL LEAD TOWIDESPREAD FREEZING CONDITIONS THIS MORNING. MOST LOCALES ACROSSSANTA CRUZ...COCHISE AND GRAHAM COUNTIES WILL CONTINUE TO FALLINTO THE 20S. EASTERN PORTIONS OF PINAL COUNTY WILL FALL BELOWFREEZING AS WELL. PORTIONS OF THE TUCSON METRO AREA ARE EXPECTEDTO EXPERIENCE NEAR FREEZING TEMPERATURES...PARTICULARLY NEARWASHES AND FOOTHILL LOCATIONS.THIS COLD AIRMASS WILL PERSIST FOR YET ANOTHER MORNING...WITH WIDESPREADFREEZING OR NEAR FREEZING TEMPERATURES EXPECTED FRIDAY.PRECAUTIONARY/PREPAREDNESS ACTIONS...A FREEZE WARNING MEANS SUB-FREEZING TEMPERATURES ARE EXPECTED.THESE TEMPERATURES WILL KILL SENSITIVE CROPS AND VEGETATION.COVER THEM...IF POSSIBLE...WITH CLOTH SHEETS OR BLANKETS TOPROTECT THEM FROM FREEZING.