Take a roll in the leaves together during the fall. As you’re both lying in the leaves, pull the ring out of your pocket and ask them to marry you.
Create an autumn feast, complete with pumpkin pie and apple cider. Afterwards, take a long country drive and ask them in amongst all the wonderful colored leaves.
Take your sweetheart on a hayride or to a pumpkin patch and propose as you take in all the autumn smells and colors.
Get a big scarecrow for your front yard at a local crafts store. Put it out in the yard with the ring attached to it’s neck. Add a sign (using safety pins) that asks “Will you marry me?”
When raking in the fall, rake the leaves into a heart shape and get down on one knee as you tell your partner that you want to marry them.