A note to our Gardeners from King Street Garden Coordinator Chris Clay:
Tonight is the reason we don't plant our tomatoes and other hot weather plants until May, despite the amazing weather we've been having. There is a strong chance of freeze tonight, and if you have planted tomatoes in your plot they will need protection to survive the night if the temperature dips to freezing. If you do have tomatoes planted you have a couple of options to save them.
One is to transplant them out of the garden and keep them indoors overnight. Tomato root systems are incredibly durable and can handle the transfer. This is the only fool proof way to save them that I know of.
Another would be to purchase some floating row covers to cover your plot. They will provide at least a couple of degrees of protection and may make the difference, though it will be dicey. You can add additional coverage by placing multiple 2 liter bottles filled with warm water in the plot under the row covers. This will provide a couple more degrees of protection. If you buy a light floating row cover leave the cloth as doubled up as you can while covering the bed. If you have other non-tomato warm weather plants this may be your best chance to save them.
Option three is to gamble that the weather service is wrong and see what happens. In the worst case scenario you can always replant.
Peas and other cold hardy plants should do fine tonight, though a row cover never hurts. This is primarily a warning for anyone who has planted warm weather plants.
If you don't have any row covers, I have had luck with old towels and blankets, prop them up with sticks or pots or whatever works. Just be sure to remove them in the morning!