Published: Dec 28, 2010 6:49 PM EST
Updated: Dec 28, 2010 3:52 PM EST

LEE COUNTY, Fla.--  Yet another bout of bitter cold weather keeps farmers working through the night to protect their produce.

They spent Tuesday morning assessing the damage and preparing for more cold weather tonight.

At 31 Produce in Lee County, the hardest hit crops were squash, zucchini and cucumbers.

Owner Mike Greenwell says at one point overnight, the temperature dropped as low as 28 degrees for 45 minutes and then hovered around 30 degrees for much of the night.

They covered as much as they could with frost cloth, but Greenwell says just covering two rows of crops costs $250. He often weighs the decision to cover against the cost to just re-plant.

He thinks tomato prices will continue to increase as a result of the freeze, coupled with the heavy rain seen in California recently.

Two weeks ago, tomatoes were selling at about $8 a box. Greenwell says, the price has climbed to the $20 range. He thinks they will reach the $40 mark by next week.

Some frost built up on the strawberries and blueberries, but thanks to the irrigation system, they were well protected and survived this latest cold snap.