Pull the stem off the foam pumpkin and discard (or save it if you'd like to use it for your yarn pumpkin stem).
Using an apple corer, apply pressure to the center of the foam pumpkin. Depending on the type of pumpkin, you may have to twist it around a bit to get through the top layer.If you can't get the corer all the way through, turn the pumpkin over and come in from the bottom as well.Remove the corer and use your finger to remove the loose, excess styrofoam from the center of the pumpkin.
Cut a length of yarn around 20 feet long and thread it onto a yarn needle.(You can use a smaller length of yarn to make it easier to work with - you'll just have to change strands a lot more often.)
Step 2: Start covering pumpkin
Hold the loose end of the yarn against one of the grooves in the pumpkin and put the yarn needle through the top of the pumpkin.
Pull the yarn all the way through until it's taut.
Bring the yarn from inside the pumpkin over top of the loose end strand.
Put the needle through the center of the pumpkin again, and make sure that the loose strand is secure. Do another strand over top of it if needed.Now place a strand into the next groove on the pumpkin.
Continue looping your needle inside the pumpkin and pulling the yarn tight over the outside, filling in along the pumpkin "rib".
When you're close to the end of your yarn (leave at least 6 inches loose), put the needle under one of the strands and push it through the bottom, pulling the needle loose from the yarn. (Cut the loose strand of yarn shorter if it hangs out the bottom of the pumpkin.)If you're finding it difficult to pull your needle through, pull it back up and unwind one of the strands so you have enough yarn to pull it easily.
Step 3: Start new strand of yarn
Cut another 20 foot strand of yarn and thread the needle.
Start the second strand the same way as the first, overlapping the loose strand so it stays secure.
Continue looping the yarn inside the pumpkin and around the outside. Make sure to keep your strands fairly straight from bottom to top for the nicest look.Start a new strand of yarn if necessary.
When you've finished covering the outside of the pumpkin (overlapping areas if necessary), finish at the bottom of the pumpkin.
Snip the strand of yarn as close to the pumpkin bottom as possible.
Step 4: Add stem
Using pruning shears, cut a stick from the garden to around 2 inches long.Turn the pumpkin over and insert the stick in the hole of the pumpkin, pushing it halfway down so about 3/4 inch is showing.
Your chunky yarn pumpkin is complete!
Video
Notes
If you don't have an apple corer, use an x-acto or craft knife to make the hole in the center of the pumpkin.