Although logs can be left in the open they do benefit from the extra protection of a cover or dedicated storage area.
Tarpaulin Cover
Never cover your logs completely with tarpaulin, this will create a seal to stop the air circulating round – ensure the sides stay uncovered for proper ventilation.
Wooden log store
An extra effective defense against moisture is to use a dedicated wooden log store, many of these features a raised floor and a slanted roof to help protect the firewood.
Usually, the front is left open; although this can cause problems with hard-driving rain, however, you will usually find that it is only the front face of the logs that get wet and these will soon dry with the natural action of the wind and sun.
Metal log store
A relatively new method of storing firewood but definitely an effective modern approach. These products offer fully enclosed protection, importantly they raise the contents off ground level and feature multiple vents to ensure free flow of air.