How Long Do You Pressure Can Asparagus

You pressure can asparagus for either 30 minutes for pint jars or 40 minutes for quart jars when using a weighted gauge pressure canner at 10 pounds of pressure.
 
If you’re using a dial gauge canner, you’ll want to process them at 11 pounds of pressure instead to be safe.
 
The exact time you pressure can asparagus depends on your jar size, your altitude, and whether you’re packing them raw or hot.
 
Either way, pressure canning asparagus is the only safe way to preserve low-acid vegetables like asparagus at home.
 
So if you’ve been wondering how long do you pressure can asparagus, the short answer is 30 to 40 minutes, but there’s more to it than just timing.
 
In this post, we’ll walk through everything you need to know about pressure canning asparagus safely, including prep, processing times, and common mistakes to avoid.
 
Let’s get right into it.
 

How Long Do You Pressure Can Asparagus?

How long you pressure can asparagus comes down to a few important factors.
 
The processing time changes based on jar size and altitude, so let’s break it down clearly.
 

1. Processing Times for Pint and Quart Jars

For pint jars, you pressure can asparagus for 30 minutes at 10 pounds of pressure using a weighted gauge canner.
 
For quart jars, the time goes up to 40 minutes at the same pressure.
 
Quarts take longer because the heat needs more time to penetrate to the center of the larger jar.
 

2. Altitude Adjustments Matter

If you live above 1,000 feet, you’ll need to increase your pressure, not your time.
 
At 1,001 to 2,000 feet, bump it up to 15 pounds of pressure for a weighted gauge.
 
Above 2,000 feet, you’ll go even higher depending on your exact elevation.
 
Always check your local altitude before you pressure can asparagus so you don’t compromise safety.
 

3. Hot Pack vs. Raw Pack

You can pressure can asparagus using either a hot pack or a raw pack method.
 
The hot pack involves blanching the asparagus briefly before packing it into jars, which helps it stay firmer.
 
The raw pack means you fill jars with raw spears and pour boiling water over them.
 
Both methods work fine, and the processing time stays the same whether you hot pack or raw pack.
 

Steps to Pressure Can Asparagus Safely

Knowing how long do you pressure can asparagus is only half the battle.
 
The prep work and canner setup matter just as much.
 
Here’s how to do it right.
 

1. Choose Fresh, Firm Spears

Start with fresh asparagus that’s firm and crisp, not limp or woody.
 
Wash the spears thoroughly and trim off the tough ends.
 
You can cut them to fit your jars, usually into 1-inch pieces or leave them whole for pint jars.
 

2. Pack Your Jars Correctly

Pack the asparagus tightly into clean, hot jars, leaving 1 inch of headspace at the top.
 
Add 1/2 teaspoon of canning salt per pint or 1 teaspoon per quart if you like.
 
Then pour boiling water over the spears, making sure everything stays covered.
 
Remove air bubbles with a plastic spatula and wipe the rims clean before sealing.
 

3. Use a Properly Venting Pressure Canner

Place your jars in the pressure canner with 2 to 3 inches of hot water in the bottom.
 
Lock the lid and turn up the heat until steam flows steadily from the vent for 10 minutes.
 
Then add the weighted gauge or close the petcock and let the pressure build.
 
Once you hit 10 pounds of pressure, start your timer and pressure can asparagus for the full 30 or 40 minutes.
 

4. Let the Canner Depressurize Naturally

When the time is up, turn off the heat and let the canner cool on its own.
 
Don’t rush it by removing the weight or opening the lid early.
 
Wait until the pressure reads zero and the canner has rested for a few more minutes.
 
Then carefully open the lid, tilting it away from you to avoid steam burns.
 

Common Mistakes When You Pressure Can Asparagus

Even folks who know how long do you pressure can asparagus sometimes slip up on the details.
 
Here are the mistakes to watch out for.
 

1. Using a Water Bath Canner Instead

Never use a water bath canner for asparagus because it’s a low-acid vegetable.
 
Water bath canning only works for high-acid foods like pickles and jams.
 
Asparagus needs the higher heat that only a pressure canner can deliver to kill harmful bacteria.
 

2. Forgetting to Adjust for Altitude

If you skip the altitude adjustment, your asparagus may not be safely processed.
 
Always increase pressure, not time, when you’re at higher elevations.
 
This ensures the internal temperature gets high enough to destroy botulism spores.
 

3. Overpacking the Jars

Cramming too much asparagus into a jar leaves no room for proper heat circulation.
 
Leave that inch of headspace and don’t press the spears down too hard.
 
Overpacked jars can also lead to siphoning and failed seals.
 

4. Skipping the Steam Venting Step

Venting the canner for a full 10 minutes is not optional.
 
It removes trapped air so the pressure reading is accurate.
 
If you skip this step, you might pressure can asparagus at the wrong pressure without realizing it.
 

So, How Long Do You Pressure Can Asparagus?

You pressure can asparagus for 30 minutes for pints and 40 minutes for quarts at 10 pounds of pressure with a weighted gauge.
 
Adjust the pressure upward if you’re at a higher altitude, and always use a pressure canner, never a water bath.
 
Now that you know exactly how long do you pressure can asparagus, you can preserve your harvest with confidence and enjoy home-canned asparagus all year long.
 
Happy canning.