Pressure Canning Corn: Raw Pack or Hot Pack Method
Preserving sweet corn is one of those simple homestead jobs that feels like a lot of work in the moment, but it is always worth it later. If your family loves corn as much as mine does, learning how to pressure can it is a great way to preserve fresh flavor and keep jars of homegrown food on the shelf.
We use canned sweet corn all year long. It is one less store-bought product we need to buy, and I like knowing exactly how it was grown and processed. I learned how to can corn years ago with my mom, and now it is something the whole family helps with when sweet corn season hits here in North Dakota.
When the corn is ready, we enjoy plenty of it fresh off the cob first. We grill it, boil it, and slather it with butter. Then once we have had our fill, it is time to get serious about preserving the rest. Pressure canning sweet corn is one of the best ways to keep enjoying the harvest going long after summer is over.
Why Corn Must Be Pressure Canned
Sweet corn is a low-acid vegetable, which means it must be pressure canned for safe long-term storage. Unlike jams, jellies, and pickles, corn does not have enough acid to make it safe for water bath canning.
That is why pressure canning is the right method for preserving whole kernel corn. The high heat inside a pressure canner is what makes canned corn shelf-stable and safe to store in your pantry.
If you are new to pressure canning, do not let that scare you off. It takes attention and patience, but once you learn the process, it becomes part of your regular homestead routine.
Best Corn for Pressure Canning
The best corn for canning is fresh sweet corn picked at the right stage. Flavor matters, but freshness matters just as much. If the kernels are full, juicy, and tender, you are in good shape.
I like to check the cobs by feeling through the husk first. The cob should feel firm and filled out. Then I peel back a bit of the silk and make sure the kernels look plump.
If your corn gets a little too mature, you can still preserve it, but the texture changes. Overripe corn usually has more starch, less sweetness, and kernels that are not as crisp. I still use that corn, but I prefer it in soups or other recipes where texture matters less.
It takes about 2 to 2 1/2 good-sized ears of corn to fill one pint jar. If you are doing a full canner load, plan on picking a lot more fresh corn than you think you may need.
Ingredients and Equipment
Ingredients
- Fresh sweet corn
- Boiling (hot) water
- Salt, optional
Equipment
- Pressure canner (Pressure weight or gauge)
- Pint or quart canning jars
- Lids and bands
- Large pot for blanching
- Sharp knife
- Cutting board or sheet pan
- Jar lifter
- Wide-mouth funnel
- Bubble remover or butter knife
- Clean towels
- Ladle (if using hot pack method)
How to Prepare Corn for Canning
Getting the corn ready is the part that takes the most time. On our homestead, this usually turns into a full evening project. Once the sweet corn starts rolling in, my counters, pots, and towels all get put to work.
I like to wash my jars ahead of time so they are clean and ready to go. Then I set out my lids, bands, towels, and tools before I start.
Husk the Corn and Remove the Silk
First, shuck the corn and remove as much silk as possible. This is the easy part, and it is a good job for the whole family. We usually do this outside on our patio and toss the husks and silk to the pigs and chickens later.
Try not to shuck more corn than you can process in the next couple of days. The husk helps protect the fresh corn until you are ready to can it.
Blanch the Corn Before Cutting
After husking, blanch the cobs in boiling water for 1 to 2 minutes. Then move them to an ice bath right away. This helps set the color and makes the kernels easier to cut off the cob.
Do not overblanch the corn. You do not want to cook the corn too much before it even goes into the jars.
How to Cut Corn Off the Cob
This is the messiest part of the whole method. I like to stand the cob upright on a sheet pan and slice the kernels off with a sharp knife. Cut the whole kernel off, but do not cut too deeply into the cob.
You want the kernels, not all the starchy pulp behind them.
Why You Should Not Scrape the Cob
Do not scrape the cob after cutting off the kernels. That extra starch can make your jars cloudy and affect the final quality of your canned corn. But don’t toss the cobs! We have some uses for them also.
Raw Pack vs Hot Pack Corn
When it comes to pressure canning corn, there are two main ways to do it: raw pack or hot pack.
Both methods are approved for canning whole kernel corn. The main difference is how the corn is prepared before it goes into the jars.
What Is the Raw Pack Method?
With the raw pack method, you put the raw corn kernels into jars, add hot water ( I just use hot water out of the tap), leave the right headspace, remove air bubbles, and process the jars.
This is the method I use most often because it is simple and moves faster when I am canning a large batch or batches.
What Is the Hot Pack Method?
With the hot pack method, you simmer the corn kernels in water before filling the jars. Then you pack the hot corn into the jars, add cooking liquid, remove air bubbles, and process.
It adds one more step, but some people prefer it.
Which Method Is Better?
Honestly, I have done both raw pack and hot pack, and I have not noticed a major difference in the finished corn. If I am doing a large amount, I prefer raw pack because it is quicker. If you are new to canning corn, try both methods and see what works best for you.
How to Pressure Can Corn With the Raw Pack Method
If you want a simple guide, this is the method I would start with.
Fill the Jars
Add raw corn kernels to clean pint or quart jars. Do not pack them in too tightly.
Add Salt if Desired
Salt is optional, but many people like it for flavor. Add 1/2 teaspoon to pint jars or 1 teaspoon to quart jars if using.
Add Hot Water
Pour boiling or very hot water over the corn, leaving 1 inch of headspace. I use hot water from the tap; you just don’t want to use cold water.
Remove Air Bubbles
Run a bubble remover or butter knife around the inside of the jar to release trapped air. Adjust the water if needed to keep the proper headspace.
Wipe Rims and Apply Lids
Wipe the jar rims clean (I use vinegar), apply the lids and bands, and place the jars into the hot pressure canner. Seal the canner and bring it up to pressure, gradually.
How to Pressure Can Corn With the Hot Pack Method
The hot pack method is also a good option if that is what you prefer.
Simmer the Corn
Place the cut corn kernels in a large pot with water and bring them to a simmer. Measure out your corn; for every 4 cups of corn, add 2 cups of water.
Fill the Jars
Fill the clean jars with the hot corn and cooking liquid, leaving 1-inch headspace.
Add Salt if Desired
Add 1/2 teaspoon salt to pint jars or 1 teaspoon to quart jars if you want.
Remove Air Bubbles and Apply Lids
Remove air bubbles, wipe the rim of the jar, and add lids and bands before placing the jars into the hot canner. Secure the lid and gradually bring it up to pressure.
Processing Times for Pressure Canning Corn
Once your jars are filled and loaded into the pressure canner, process them using the correct time and pressure for your jar size and altitude.
Processing Time for Pint Jars
Pint jars are processed for 55 minutes.
Processing Time for Quart Jars
Quart jars are processed for 1 hour and 25 minutes.
Raw Pack and Hot Pack Use the Same Processing Time
Yes, both raw pack and hot pack use the same processing time. The only difference is the packing method.
Pressure and Altitude Chart for Pressure Canning Corn
When pressure-canning corn, the processing time remains the same, but the pressure varies with your altitude and canner type. Always use the correct pressure for safe home canning.
Always check your local elevation and follow tested canning guidelines for your exact canner.
Altitude Adjustments Matter
Always use the right pressure for your altitude and your type of pressure canner. This part matters. A weighted gauge canner and a dial gauge canner both work.
Cooling, Sealing, and Storing Your Jars
After processing, let the jars cool completely on a towel-lined counter.
Once the jars are fully cool, check each lid for a proper seal. If the center of the lid moves up and down when pressed, that jar did not seal.
I always remove the bands once the jars are cool and double-check the lids. I have had false seals before, and it is better to catch them before putting jars into storage.
Wash off any sticky jars, dry them well, label them, and store them in a cool, dark, dry place.
How to Store Home-Canned Corn
Store your canned sweet corn out of direct sunlight and away from moisture. A pantry, basement shelf, or cool storage room works well.
We go through our jars fast around here, but properly canned corn will keep well for a long time (1-5 years) when stored in good conditions.
Common Problems When Canning Sweet Corn
Even when you do everything right, a few things can still happen during pressure canning, and if you’re new to pressure canning, you may second-guess if your canned sweet corn is safe to eat.
Why Did My Corn Turn Darker in the Jar?
Some varieties of sweet corn darken more than others during canning. Usually, that comes down to sugar content and variety. It may look a little darker, but the flavor is usually still great.
Why Did My Jars Lose Liquid?
This is called siphoning. It can happen if the pressure changes too fast, if the jars were overfilled, or if the canner was not regulated well. It is one reason you should never rush pressure canning.
Why Is My Corn Floating?
Sometimes corn floats because of air trapped in the jar or because of the density of the kernels. It does not always happen, and it is usually not a problem by itself.
Why Is My Canned Corn Softer Than Frozen Corn?
Pressure-canned corn will always be softer than frozen corn. That is just the nature of the preserving method. If you want the freshest texture possible, freezing is usually better. If you want shelf-stable jars, pressure canning is the way to go.
FAQs About Pressure Canning Corn
Can You Can Corn on the Cob?
No, corn should be removed from the cob before canning. The cob is too dense, takes up too much room, and is not the right product for this method.
Is Salt Required When Canning Corn?
No. Salt is optional and mostly used for flavor.
Can You Use Frozen Corn?
Yes, frozen corn can be canned, but keep in mind the texture may be a little different than fresh corn.
Can You Water Bath Can Sweet Corn?
No. Sweet corn is a low-acid food and must be pressure canned for safety.
How Long Does Home-Canned Corn Last?
When stored properly, canned corn lasts a long time,1-5 years. For the best quality, rotate through your jars regularly and use the oldest first.
Can You Make Cream-Style Canned Corn?
Yes, but that is better covered in a separate guide because cream-style corn is a different method from whole kernel corn.
Pressure Canning Sweet Corn (Raw Pack or Hot Pack)
Equipment
- Pressure Canner
- Wide Funnel
- Large Kettle
- Tongs, & Spoon
- Canning Jars, lids and bands Pints or quarts
- Jar lifter
- Knife & Cutting board
- Butter knife or wooden spoon to debubble
Ingredients
- 17-18 Cups Sweet Corn 20 pounds or 18-25 ears of corn
- 8-13 Cups Hot Water as needed
- Salt (canning or kosher) optional, 1/2 teaspoon per pint & 1 teaspoon per quart
Instructions
- Prep Equipment. Wash canning jars, set out lids, canning bands, towels to cool jars on.
- Shuck Corn. Remove husks and silk from corn cobs. Blanch in large kettle of simmer water. Chill. Cut corn off the cob.
- Fill Jars. Raw Pack Method. Pack pint or quart jars with corn kernels, add salt if using. 1/2 teaspoon per pint jar and 1 teaspoon per quart jar. I start heating the water in my pressure canner at this step, add 3 quarts of water to the canner.Add Water. Pour hot water over top the corn until you reach 1 inch below jar rim.Hot Pack Method. Heat corn kernels in a large kettle until simmering. Fill jars, leaving 1 inch headspace. Add salt if using. 1/2 teaspoon for pints, 1 teaspoon for quarts.
- Remove Bubbles. Using a butter knife or the handle of a wooden spoon remove bubbles trapped inside the jar.
- Add Lids & Bands and lightly tighten. Do not over tighten.
- Place Jars in Pressure Canner. Secure lid and vent steam for 10 minutes. Add weight. Bring up to pressure (adjust for altitude) start timer, and process for 55 minutes for pints or 1 hours and 25 minutes for quarts.
- After Processing. Turn off heat, let jars cool in the canner for 20-30 minutes, until pressure returns to normal. Remove lid, remove jars using a jar lifter. Let cool on the counter for 5-10 hours. Remove canning bands, check seals and wash jars.
- Label and Date. Store in a cool dark pantry. Keeps for 2-4 years if stored properly.
Notes
Pressure Canning Corn is a Great Skill
Learning how to pressure can sweet corn is a great skill for anyone wanting to preserve fresh food at home. Whether you choose the raw pack or hot pack method, the result is a pantry shelf filled with jars of sweet corn ready for soups, side dishes, casseroles, and easy meals.
For me, canning corn is about more than just preserving a vegetable. It is part of homestead life, part of feeding my family, and part of knowing how to make the most of what we grow or bring home fresh from the field.
If you are just getting started, keep it simple, follow the right method, and do not be afraid to learn as you go.
Here are some other canned goods you may want to try.
- Pressure canning green beans, easy-to-follow instructions, and a recipe.
- Learning to pressure can. This post covers all the safety tips to help you feel more confident using your pressure canner.
- On a budget? Here is a basic guide to canning supplies on a budget, perfect for helping save some money.
- Thrift store hunting for canning jars? I go into what you should be looking for and what to pass up.
- Wondering if your vintage or used canning jars are still safe to can in? Here are the guidelines I follow when determining whether to use vintage jars or keep them for decor on the homestead.
