My mother in law is an avid gardener, and on several occasions complained about rodents, woodland creatures and even her own dog eating or otherwise destroying her plants. The growing season in Canada is also relatively short compared to more southern countries, limiting what you can grow every year.
The solution? A cold frame! Basically a greenhouse with an open bottom, it can protect your plants from the elements and from animals. Because it acts like a greenhouse, you can start plants earlier in the year and keep them growing later into the year than normal.
It's easy to build one in a weekend using common tools and materials.
Step 1: Tools and Materials
A hand-held drill (cordless or corded)
A miter saw (powered is better, but you could do it with a hand saw and miter box)
A jig saw, circular saw or table saw (really, anything that can cut large sheets of plywood)
A screw driver
A Tape Measure
A marking implement of some sort
A paint brush
Two, Three or Four windows, with at least one dimension in common
Some 2x2s (as required)
Some 2x3s (as required)
Some 2x4s (as required)
Some inexpensive 1/8" or 1/4" plywood
Exterior wood screws (deck screws)
Exterior wood-sealing paint
Some galvanized or brass hinges (may not be necessary if the hinges on the windows are still good)
Some big, sturdy exterior-grade handles
A tube of latex sealant
A common heating vent (optional)
I was fortunate enough to have a lot of the materials just lying around already. Some were left behind by the previous owners of the house, other pieces were left from tearing apart my basement. Use reused materials were you can!