Frost and the Fall Garden

comments (3) September 21st, 2009

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Ruth Ruth Dobsevage, Web producer
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Even though the vines are dead or dying, pumpkins can stay in the field well past frost.
Leeks (in the background) are at their best in fall weather, but peppers will succumb to even a touch of frost. Harvest them when frost threatens.
Tomatoes are not frost hardy, so harvest them early. Green tomatoes will ripen slowly in a dry, cool part of the house; dont refrigerate them.
Even though the vines are dead or dying, pumpkins can stay in the field well past frost.Click To Enlarge

Even though the vines are dead or dying, pumpkins can stay in the field well past frost.

Photo: Ruth Dobsevage

It's September. Kids return to school, the sun is lower in the sky, the nights grow nippy. There's a crispness to the air, and if you look carefully, you'll catch the tinges of color in the New England swamplands. Ordinary folk watch football. Gardeners go on frost watch.

If you're new to gardening, you may not be aware that frost can wipe out most of your veggies. So here are some things you should know about frost and how to protect your garden against it, or at least forestall its effects.

  What is frost, and what does it mean for your garden?
Ice crystals form at temperatures below 32°F, when water vapor condenses out of the air and settles on a cool surface, such as your garden beds or garden plants. Frost is just a frozen form of dew, and it damages plants by freezing the water inside the plant cells, which then burst and die.

A light frost can occur at 30-32°F. There's a touch of white on the ground, but it's short-lived; as soon as the sun hits it, it's gone, and all but the most frost-sensitive plants will survive. At lower temperatures, a killing frost can occur, and you can pretty much say good-bye to most of your annual flowers and most vegetables.
The Farmer’s Almanac can tell you the average killing frost date for your area (here in Connecticut, it's October 10), and that will give you a general ideal of what to expect. But it won't help you much with anticipating light frosts. You also have to know your microclimate. A low-lying area may be covered in frost, while just uphill a bit everything is fine.

As we all know, weather can be quirky. As the days get shorter, I check the forecasts frequently, and get a sense of things as I walk the dog after work. Is the sky cloudless and the wind minimal? Is there a chill in the air? Does it smell like frost? If so, there's work to be done.

When frost threatens
Crops differ in their susceptibility to frost, and there are steps you can take to extend the season. These maneuvers are worthwhile, because typically a frost is followed by Indian summer: and its warm, sunny weather before things really chill down.

If a light frost is predicted, I cover my frost-sensitive crops with assorted bedsheets, blankets, and tarps and hope for the best. The next morning, anticipating rising temperatures, I remove the coverings.

If you don't cover your plants and frost hits them, you can sometimes save them by hosing off the frost early in the morning before the sun hits them.

What to harvest when
If you're like me, you'll want to keep your garden going as long as you can. So you won't want to put your garden to bed until it becomes absolutely necessary.

The measures described above work for a while, but at a certain point, enough is enough. Even if the plants are alive, they are no longer actively producing. When a hard frost is imminent, I bow to the inevitable. After thanking the garden (my quiet, but essential annual ritual), I harvest all remaining tomatoes (ripe or not), cucumbers, hot peppers, sweet peppers, eggplant, beans, and basil, along with any frost-sensitive flowers I’d like to enjoy a bit longer in a vase—or in a salad.

I don’t usually harvest the winter squash and pumpkins yet, as these survive just fine in the field even if the vines die. Leeks, scallions, beets, and carrots are in no danger from frost either, and members of the cabbage family—brussels sprouts, broccoli, and kale—actually improve in flavor with frost. These remain flavorful even into winter most years. Parsley also does well until Thanksgiving and sometimes beyond, as do sage and chives.

A quick guide to frost hardiness
Frost sensitive
(Harvest these plants when the temperature dips to 32°F or less)
Somewhat frost hardy
(These crops may survive temperatures as low as 28°F)
Very frost hardy
(Don't rush to harvest these; they'll be fine at 28° or colder)
Tomatoes
Cucumbers
Hot peppers
Sweet peppers
Eggplant
Beans
Basil
Nasturtiums
Melons
Summer squash
Nasturtium
Sunflower
Lettuce
Arugula
Chard
Escarole
Endive
Cabbage
Nicotiana
Leeks
Scallions
Chives
Brussels sprouts
Broccoli
Kale
Parsley
Beets
Carrots
Winter squash
Pumpkins
Sage



It's fall garden cleanup time More on fall gardening:

Plant a Green Manure or a Cover Crop This Fall
It's Fall Garden Cleanup Time
Plant a Second Crop for a Bountiful Fall Harvest
Cold Frame Gardening
• Topping Brussels Sprouts
Video: Fall Vegetable Garden 

 

 


posted in: fall garden, maintenance

Comments (3)

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Posted: 7:40 am on December 6th
lostmountainman writes: We live at 2000 ft. in elevation and it often does not frost until mid-late November, but in the local lowlands, which is where the local TV forecasts focus, it will frost in early-mid October. There is a website that gives very specific forecasts from the National Weather Service and helps us prepare the garden for a frost (and the hose bibs for a freeze). The link to the main site is: http://forecast.weather.gov/MapClick.php
Enter your city and State or your Zip Code and you will get the general forecast for your area. Zoom in on the map until you see the named road system and see how close the location is to your home (or if you know the GPS coordinates you can enter them). Place the mouse pointer on the map and hold the left mouse button down and drag the map to where you want to locate. Place the pointer where you want it and double click and you will place the + with the red shaded square close to your home (the map will zoom out to the default setting automatically). Zoom in again to check the location. If you are close but want to get closer repeat the process. If the location that you want is within the shaded red square it will not relocate. If that happens locate the mouse pointer somewhere a little bit away from where you want to be and double click to move the red square. Then zoom in again and place the pointer where you want to locate and double click and it should put the + as close to the desired location as the system will allow.
I find that the 24 hour forecast is very accurate, and the 48 hour forecast about 80% accurate. After that things can change significantly. The system usually predicts the nighttime low to within a degree of the readings from our outdoor digital thermometers. The snowfall depth predictions are generally very accurate as well, which helps us protect the plants that can be crushed by a heavy snowfall.
Save the link in your "Favorites" folder and you can return as often as you like to check the coming forecast and any changes that develop.
Posted: 2:55 pm on September 29th
pano2nr writes: Wow! Thanks! This is exactly the information i needed..tonight, here in southeastern MI. Thanks, thanks, thanks!!!
Posted: 8:04 pm on September 30th
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