It will be a lot happier sitting uncovered under an awning.
4 lengths of 2x4 and 2 sheets of corrigated iron.
After that, if you have rops fitted sling a single canvass tarp over the rops and tie it off to the engine guard at the back and the castors at the front.
Never ever tarp it over and hold the tarp down with bricks on the ground
It will live under my home, which is 11' above the slab however, my wife thought it would look nicer under a custom cover.
A good heavy natural fiber tarp may just have to suffice so it can breath.
Thanks
So it is not in the weather.
Easy get a big BBQ cover WITH A VENT in it.
Other than that a HD motorcycle cover should fit over it and get the ones that have velcro slots for the mirrors and leave the slots open.
You can buy custom mower covers, most mower shops carry them but they are not vented.