Pumpkin Purée from Whole Pumpkins: Pressure Canning Guide (and What I Learned the Hard Way)
Only you guys will understand the rabbit hole I went down last night and tonight. My husband thinks I am certifiable. It all started Saturday with a local Facebook page post asking if anyone can use a straw bale. I realized I had not replaced the straw in the feral cat house yet and said I would gladly take it since it was kept dry on a covered porch. When I got there, the gentleman asked if I wanted all the pumpkins too. I said if no one would use them to feed animals, I can compost them in my composters. So he loaded up everything into my car. The straw went into the kitty house that day. The rest covered my garlic shoots. Anyway, then there were all these pumpkins!
So last night I decided to remove all the seeds from the pumpkins so I don't end up with a million pumpkin plants and because they are yummy roasted. The white pumpkin was so pretty and smelled so good when I was seeding it, I decided that I needed to cook it down, maybe make purée, so I peeled it and cooked it and an orange pumpkin that also looked like a good one. Ended up with 9 jars full of purée. Then I decided that this was the perfect time to learn to use my pressure canner that I bought to can my pasta sauce but chickened out and WB'd it. So, I looked up time and pressure, then set it up and canned those jars. Had to run it twice because I had too many jars. Also roasted 10 cups of seeds and went to bed at 12:30am. Sigh. Mind you, I hate all things pumpkin spice. So, I had no idea why I was doing it. Dumped the rest in my compost.
This morning I went to take the rings off to check for seals and one of the lids did not seal. So I put it in the fridge to deal with later. After work, I decided to make pumpkin bread muffins, but with apple pie spice to avoid the cloves. Ended up with 24 delicious super moist muffins, bunches of roasted seeds, and 8 more jars of purée. All because I wanted some straw for the kitty house. LOL, the football player teenagers are half way done with the muffins already.
That's the story, and it's exactly the kind of kitchen adventure that makes home canning so rewarding — and sometimes a little chaotic. If you've ever found yourself with more pumpkins than you know what to do with, this guide is for you. Below is a practical, step-by-step method for turning whole pumpkins into shelf-stable pumpkin purée, plus the lessons I learned along the way (including that one jar that didn't seal).
Why You'll Love This Recipe
It turns free or cheap pumpkins into shelf-stable food. If you've got pumpkins from a neighbor, a farm stand, or your own garden, this is the best way to preserve them.
You control the texture. Homemade purée is as smooth or as chunky as you like, and you can adjust the consistency by draining it.
It's a great first pressure canning project. Pumpkin purée is a simple, low-ingredient recipe that helps you get comfortable with your pressure canner.
It saves money. Canned pumpkin from the store is convenient, but homemade purée from free pumpkins is practically free.
It's versatile. Use the purée for pies, muffins, breads, soups, and more.
Ingredients You'll Need
Makes about 8 to 9 pint jars of purée (depending on the size of your pumpkins)
2 to 3 medium whole pumpkins (sugar pumpkins or pie pumpkins work best)
Water for the canner
For Serving or Baking (Optional):
Apple pie spice, cinnamon, or pumpkin pie spice, to taste
Why These Ingredients Matter
Sugar pumpkins or pie pumpkins have denser, sweeter flesh and less water than carving pumpkins, which makes for a richer, more flavorful purée. Carving pumpkins will work, but the purée will be thinner and less sweet.
Water is the only thing you need for pressure canning purée. Do not add anything else to the jars before canning.
A Quick Note on Canning Pumpkin Purée
There's a lot of conflicting information out there about canning pumpkin. The USDA and the National Center for Home Food Preservation recommend pressure canning cubed pumpkin, not purée, because purée is too dense for heat to penetrate safely. However, some tested sources and extension offices provide guidance for pressure canning purée in small jars with specific processing times. Always verify the current guidance with your local extension service or the National Center for Home Food Preservation before canning purée. If you're unsure, the safest option is to freeze the purée instead.
Ingredient Substitutions
Pumpkins: Butternut squash, acorn squash, and other winter squash can be prepared the same way. The flavor will be slightly different but still delicious.
Pumpkin pie spice: Apple pie spice, cinnamon, nutmeg, or ginger can be used to season the purée when you bake with it, but do not add spices to the jars before canning.
Sugar: Not needed. Pumpkin purée is naturally sweet.
Equipment Needed
Pressure canner (required for safety)
Pint jars or half-pint jars, washed and kept hot
New lids and rings
Jar lifter
Canning funnel
Bubble remover or thin spatula
Clean dish towels
Large baking sheet
Knife and spoon (for scooping seeds and flesh)
Food processor or blender (for puréeing)
Fine-mesh strainer or cheesecloth (for draining excess water)
Large pot (for cooking the pumpkin)
Ladle
Step-by-Step Instructions
Step 1: Prep the Pumpkins
Wash the pumpkins well. Cut them in half or into large chunks, depending on the size. Scoop out the seeds and stringy pulp, and set the seeds aside if you want to roast them later.
Step 2: Cook the Pumpkin
You can cook the pumpkin by roasting, steaming, or boiling.
Roasting: Place the pumpkin halves cut-side down on a baking sheet and roast at 400°F for 45 to 60 minutes, until the flesh is tender and a knife slides in easily.
Steaming: Place the pumpkin pieces in a steamer basket over boiling water and steam for 20 to 30 minutes, until tender.
Boiling: Place the pumpkin pieces in a large pot of boiling water and cook for 15 to 20 minutes, until tender.
Roasting gives the best flavor, but steaming and boiling are faster.
Step 3: Make the Purée
Let the pumpkin cool enough to handle, then scoop the flesh away from the skin. Purée the flesh in a food processor or blender until smooth. If the purée is very watery, drain it in a fine-mesh strainer or cheesecloth for 30 minutes to an hour to remove excess liquid. This step is important for a thicker, more flavorful purée.
Step 4: Fill the Jars
Ladle the purée into hot pint or half-pint jars, leaving 1 inch of headspace. Use a bubble remover or thin spatula to remove air bubbles. Wipe the rims clean with a damp cloth. Apply the lids and rings until finger-tight.
Step 5: Pressure Can
Place the jars in your pressure canner according to the manufacturer's instructions. Process pint jars according to the current tested guidelines for your altitude — always verify with your local extension service or the National Center for Home Food Preservation before canning. The processing time for purée is typically longer than for cubed pumpkin, so check the most up-to-date guidance.
Step 6: Cool and Store
Turn off the heat and let the canner depressurize naturally. Once the pressure reads zero, wait 10 minutes, then carefully open the canner and remove the jars using a jar lifter. Place them on a towel to cool undisturbed for 24 hours.
Check the seals — the lids should be concave and not flex when pressed. Label and store in a cool, dark place.
Expert Tips
Use the right pumpkin. Sugar pumpkins and pie pumpkins are denser and sweeter than carving pumpkins. Carving pumpkins work, but the purée will be thinner.
Drain the purée. Pumpkin flesh holds a lot of water. Draining it for 30 minutes to an hour before filling the jars gives you a thicker, more flavorful purée.
Check your seals. One of my jars didn't seal, and it went straight into the fridge. Always check every lid after the jars cool. A lid that flexes or pops when pressed did not seal and should be refrigerated and used within a few days.
Don't overfill the canner. I had to run my canner twice because I had too many jars. It's better to run two batches than to crowd the jars and risk a bad seal.
Roast the seeds. Toss the seeds with a little oil and salt and roast at 350°F for 15 to 20 minutes for a crunchy snack.
Don't add spices before canning. Spices can change the pH and density of the purée. Add them when you're ready to bake.
Freeze if you're unsure. If you're not comfortable pressure canning purée, freeze it in freezer-safe containers with 1/2 inch of headspace for up to 6 months.
Recipe Variations
Roasted Pumpkin Purée: Roasting the pumpkin instead of boiling gives a deeper, caramelized flavor. This is my favorite method.
Butternut Squash Purée: Substitute butternut squash for the pumpkin for a sweeter, smoother purée.
Pumpkin Bread Muffins: Use the purée to make pumpkin bread muffins with apple pie spice instead of pumpkin pie spice — the apple pie spice skips the cloves and gives a warmer, fruitier flavor.
Pumpkin Soup: Use the purée as a base for creamy pumpkin soup.
Pumpkin Pancakes: Stir a few spoonfuls of purée into your favorite pancake batter.
Storage and Freezing
Canned: Properly sealed jars stored in a cool, dark place are best used within 12 months for the best quality. Always check the seal before using, and discard any jars with broken seals, off odors, or signs of spoilage.
Refrigerator: Any jars that didn't seal should be refrigerated and used within 3 to 4 days.
Freezer: Pumpkin purée freezes beautifully. Pour into freezer-safe containers, leaving 1/2 inch of headspace, and freeze for up to 6 months. Thaw overnight in the refrigerator before using.
Frequently Asked Questions
Can I water bath can pumpkin purée?
No. Pumpkin is a low-acid food and must be pressure canned to be safe. Water bath canning is not safe for pumpkin purée.
Why did one of my jars not seal?
There are several reasons a jar might not seal: a nick on the rim, a lid that wasn't tightened properly, food on the rim, or a jar that wasn't hot enough when filled. Refrigerate any unsealed jars and use them within a few days.
Can I add spices to the jars before canning?
No. Add spices when you're ready to bake or serve, not before canning. Spices can affect the density and safety of the purée.
How do I make sure my purée is thick enough?
Drain the purée in a fine-mesh strainer or cheesecloth for 30 minutes to an hour before filling the jars. This removes excess water and gives you a thicker, more flavorful purée.
How long does homemade pumpkin purée last?
Properly canned and sealed jars are best used within 12 months. Frozen purée is best within 6 months.
Can I use carving pumpkins?
Yes, but they are less sweet and more watery than sugar pumpkins. Drain the purée well before canning.
What can I make with pumpkin purée?
Pies, muffins, breads, soups, pancakes, and more. My favorite is pumpkin bread muffins with apple pie spice.
Printable Recipe Card
PUMPKIN PURÉE FROM WHOLE PUMPKINS (PRESSURE CANNING GUIDE)
Yield: About 8 to 9 pint jars | Prep Time: 30 minutes | Cook Time: 45–60 minutes (roasting) | Process Time: Follow current tested guidelines | Total Time: About 3 hours including canning
Ingredients:
2 to 3 medium sugar pumpkins or pie pumpkins
Water for the canner
Instructions:
Wash the pumpkins, cut them in half or into chunks, and scoop out the seeds and pulp.
Cook the pumpkin by roasting at 400°F for 45–60 minutes, steaming for 20–30 minutes, or boiling for 15–20 minutes, until tender.
Scoop the flesh away from the skin and purée in a food processor or blender until smooth.
Drain the purée in a fine-mesh strainer or cheesecloth for 30–60 minutes to remove excess water.
Ladle the purée into hot pint or half-pint jars, leaving 1 inch of headspace. Remove air bubbles and wipe the rims clean.
Apply lids and rings finger-tight. Pressure can according to the current tested guidelines for your altitude — always verify with your local extension service or the National Center for Home Food Preservation.
Let the canner depressurize naturally, remove the jars, and cool for 24 hours. Check seals, label, and store in a cool, dark place.
Notes: Always verify current canning guidance before processing pumpkin purée. Any jars that don't seal should be refrigerated and used within 3 to 4 days. Freeze the purée if you're not comfortable pressure canning it.
Disclaimer: This article is for informational and educational purposes only. Always follow safe canning practices from the USDA, the National Center for Home Food Preservation, or your local extension service. Use tested recipes and proper canning procedures to ensure food safety. Pressure canning is required for low-acid foods like pumpkin.
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