On Monday morning, May 13, 2013, we likely had our last hard frost of this spring. To celebrate, we brought out all our laundry to cover the sensitive perennials and fruit trees. At one point, one of the boys said, Hey! This sheet was on my bed!
Late spring frost is a concern for fruit trees (ours were in full bloom), blooming strawberries, raspberries, blueberries and grapes.
Small plants can often be sheltered with an overturned 5 gallon bucket. The strawberries are low to the ground, and we just placed a tarp over the row/bed and secured the corners with buckets filled with water.
Our temps dropped from 31 degrees F at 6 am when I went out to check on things to 28 degrees F just before the sun hit the earth to warm it around 8:30 am. The sky was clear and wind calm. We had the classic radiation frost conditions.
A thin sheet is often enough to prevent frost formation on tender plant tissues, and preserve the harvest. This is possible with several hours of work on a micro farm like ours, but impractical for large farms. Local strawberry fields started irrigation the evening prior, and had an inch of protective ice on the plants by the time the temps rose.
Our 10 day forecast now stretches to May 24, with no danger of frost. The charts show our 10% probability frost date at the end of May, so I think we are fairly safe to set things out of the greenhouse into the field. If I am wrong, then we will have even more things to cover next time ;)
Resources:
Resources:
- Frost probability charts per local and state (web / pdf)
- Assessing frost and freeze damage to flowers and buds of fruit trees (web)
- Critical spring temperature chart (with pictures - pdf)
- Critical spring temperature chart (without pictures - pdf)
- Vineyard frost protection ideas (web)
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