Your garden tools need a clean, dry, and accessible locale to keep safe from natures elements. A smart option is to build a handsome wood lean-to shed against the house near the patio or garden. If it's made from cedar, a naturally rot-resistant wood, it will weather nicely while protecting your goods from precipitation and insects alike. You can make one in a weekend out of off-the-shelf lumber or buy a panelized kit that screws together in under an hour.
See How to Build a Garden Tool Shed
for full step-by-step instructions.