When the forecast starts flirting with frost but my lettuce, spinach, or little brassica starts are finally taking off, this is the quick cloche frame I reach for. It uses bent wire coat hangers for the ribs and one humble yard staple—clear plastic sheeting—to turn a raised bed into a protected little tunnel that holds in warmth, blocks wind, and buys tender crops a very helpful buffer.
I love this project because it is inexpensive, fast, and surprisingly sturdy for something made from odds and ends. If you have a small raised bed and you want an old-school garden trick that still earns its keep, this is a very doable afternoon project, especially for cool-season gardeners who want a few extra weeks on both ends of the season.
Materials
Instructions
1. Preheat your oven to 350°F and line a baking sheet with aluminum foil. Set the six wire coat hangers on the sheet and warm them for 8 to 10 minutes, just until the metal is easier to bend by hand.
2. Carefully remove one hanger at a time and pull the hook section straight, then bend the wire into a smooth arch. Make all six arches the same width so they will span your raised bed evenly.
3. Push the ends of one arch into opposite sides of the raised bed so it stands like a hoop. Repeat with the remaining arches, spacing them about 12 inches apart down the length of the bed.
4. Run the garden twine lengthwise across the tops of the arches from one end of the bed to the other. Zip-tie the twine to each arch so the frame holds its shape and does not wobble in the wind.
5. Drape the clear plastic sheeting over the full frame, centering it so you have extra plastic hanging down on all sides. Smooth it gently so the plastic follows the arch shape without pulling too tight.
6. Anchor the plastic by pinning the bottom edges to the soil with landscape staples, using two on each long side. Gather the extra plastic at each end like a loose gift wrap fold and secure it with zip ties or twine so you can open one end for venting.
7. Check that the plastic is not resting heavily on the plants and that air can be let in on sunny afternoons. On cold nights, keep it fully closed; by morning, your bed will hold noticeably gentler air around the plants.
Variations & Tips
For picky weather: If your spring days swing warm by noon and cold again at night, leave one end loosely tied so you can vent it quickly after breakfast and close it again before dinner. That little routine has saved me from both frost and overheated seedlings.
For taller crops: Use the same method but space the arches a bit farther apart and make the bends taller before installing them. This works nicely for young kale, chard, and compact cabbage starts.
For windy spots: Add a second line of twine along one side of the arches, not just the top ridge, to reduce racking. If your yard gets those stubborn prairie gusts like mine does, a few extra zip ties are worth it.
For extra cold nights: Drape an old bed sheet or lightweight frost cloth over the plastic after sunset, then remove it in the morning. Layering cover over cover is an old gardener's trick because trapped air does a lot of the hard work.
Best crops to protect: I use this style most often for lettuce, spinach, arugula, baby bok choy, radishes, and newly transplanted broccoli or cauliflower. It is perfect for crops that appreciate cool air but not a hard freeze.
Easy storage: At the end of the cold spell, snip the zip ties, stack the arches together, fold the plastic dry, and tuck everything in a shed or garage. If you save the pieces flat, this little setup is easy to reuse next season.