Canning Rhubarb Pie Filling

Quick, Bright, and Versatile

This rhubarb pie filling shines bright, stays simple, and works in so many ways—perfect for taking advantage of a big spring harvest and enjoying rhubarb all year long. Here’s why it’s a keeper:

• Quick and fuss-free: just a handful of ingredients and just a little hands-on time.
• Flexible preservation: can be water bath canned to store without refrigeration or frozen for a quick grab-and-go version.
• Balanced flavor: keeps rhubarb’s natural tang with just the right touch of sugar and lemon to brighten things up.
• Safe and smooth thickening: uses ClearJel, the best thickener for canning pie fillings that set up beautifully.
• Loads of uses: from instant pies and cobblers to ice cream toppings, pancakes, yogurt swirl-ins, and beyond.

This recipe makes it so easy to turn your spring rhubarb haul into a handy pantry staple. It’s vibrant, reliable, and crafted for home preserving—whether you store jars on pantry shelves or freeze it away for convenience—so you can enjoy your rhubarb favorites all year round.

• Pantry-ready ease: One quart fills a 9″ pie perfectly, so once you’ve canned a few jars, pie night is fast and easy with no slicing or prep.
• Simple ingredients with little fuss: Using just rhubarb, sugar, lemon juice, and ClearJel, it requires only a short boil after a 2-hour maceration. It’s effortless to scale up if your rhubarb patch is abundant.
• Consistent canning texture: ClearJel is the gold standard for pie fillings in water bath canning, so your pies and desserts finish with the right set every time.
• Two easy preservation methods: Water bath canning creates shelf-stable jars good for up to a year. Freezing is a quick backup to enjoy the filling within about 6 months.
• Bright, versatile flavor: The tart-sweet balance is wonderful on its own or paired with other desserts—use it in pies, crisps, pancakes, yogurt, or ice cream for a tasty twist.
• Wonderful for gifts: Home-canned rhubarb pie filling is a thoughtful, unique gift that’s handy well beyond jam season—perfect for sharing at holidays, potlucks, or as a surprise treat.

If you have a bumper crop of rhubarb in spring, this recipe is a relaxed way to turn those stalks into something truly useful and tasty. It’s safe, tested for water bath canning, and versatile enough to fit lots of desserts. Once you make a batch, you’ll want to keep reaching for these jars all year.

Ingredients and Measurements

• 5 pounds of sliced rhubarb (slice into 1-inch chunks)
• 2 ½ cups of sugar
• 3 cups of rhubarb juice (if you don’t have enough, top up with water to make the full 3 cups)
• lemon juice
• ClearJel

How to Make and Can

1. Gather all ingredients and canning tools and set jars, lids, and rings aside.
2. Wash jars, lids, and rings; place jars in simmering water or a hot canner to keep hot.
3. Start boiling water in your water bath canner while prepping the filling.

4. Wash rhubarb stalks and slice into 1-inch chunks.

   

5. In a large stainless steel bowl, mix 5 pounds sliced rhubarb with 2½ cups sugar and stir to combine.
6. Let the rhubarb-sugar mixture sit at room temperature for about 2 hours to draw out the juice.
7. Strain the rhubarb, reserving the juice and setting the slices aside.

8. Measure 3 cups of the reserved juice and top up with water if you don’t have enough to reach 3 cups.

   

9. Whisk the measured cold juice, lemon juice, and ClearJel together in a large pot until smooth to dissolve the ClearJel.
10. Heat the pot over medium-high and bring the mixture to a rolling boil, stirring often.
11. Boil the mixture for about 1 minute to activate the ClearJel and thicken the liquid.

12. Stir the reserved rhubarb slices into the thickened juice, coat well, and bring back to a boil while stirring to prevent sticking, then remove from heat.

    

13. For freezing: let filling cool slightly, then ladle into freezer-safe containers leaving 1 inch headspace, seal, label, cool to room temperature, and freeze.
14. For canning: keep jars hot and spoon hot filling into jars leaving 1 inch headspace.
15. Remove air bubbles from filled jars, wipe rims clean, center lids, and screw on rings finger-tight.

16. Process jars in a boiling water bath: 20 minutes for quarts and 15 minutes for pints, adjusting processing time for your altitude.

    

17. Carefully lift jars from the canner and let them cool undisturbed until sealed.

18. Check seals once jars are cool; refrigerate or freeze any jars that did not seal and store sealed jars in a cool dark place.

    

Pro Tips and Pitfalls

A few little habits and checks will make this recipe easier and help avoid common mishaps. Use these tips to get the best texture, flavor, and shelf life.

• Ready your tools: Have your water bath canner boiling and jars hot before filling. Use a wide-mouth funnel, a long-handled ladle, a bubble remover or spatula, and a jar lifter to speed things up and prevent spills.
• Dissolve ClearJel properly: Always whisk ClearJel into cold rhubarb juice first to avoid lumps. Adding it to hot liquid causes clumps that won’t smooth out easily.
• Watch out for burning: Cook in a heavy-bottomed pot and stir constantly while thickening and when adding rhubarb. If the mix starts sticking or boiling too strong, lower the heat and stir until it calms down.
• Texture control: For chunkier pie filling, keep stalk chunks larger and don’t cook too long. For softer, jam-like filling, chop smaller and simmer a little more before preserving.
• Sweetness tweaks: You can cut down sugar to suit your taste, but do it gradually. Big reductions sharpen tartness and can change how the filling feels in your mouth. If you add sweet fruit like strawberries, reduce sugar a bit.
• Headspace and seal: Leave 1 inch of headspace both for freezing and canning. Remove air bubbles, wipe jar rims thoroughly, center lids, and screw on rings just finger-tight. After processing, let jars cool flat, then check seals before storing.
• Unsealed jars: Store unsealed jars in the fridge or freezer and use them quickly. You can reprocess jars if you like, following trusted canning advice, but never keep unsealed jars at room temperature.
• Fixing thin filling: If your filling seems too runny when cooled, gently warm it again and whisk in a little ClearJel dissolved in cold liquid. Bring to a full boil for about a minute to activate the thickening.
• Freezing tips: Let filling cool slightly before packing to prevent cracking containers from heat shock. Leave a 1-inch gap for expansion and clearly label each container with the date. Use within 6 months for best flavor.
• Label and rotate: Always date your jars and containers. Store canned jars in a cool dark spot and plan to enjoy them within a year for top taste.
• Altitude considerations: Adjust canning times to your elevation using USDA or local extension service guidelines. Getting the time right ensures safety and quality.

Following these small but important steps helps ensure your rhubarb pie filling thickens perfectly, seals reliably, and keeps tasting amazing whenever you use it.

Start this pie filling early in the day since it needs a couple of hours to sit and release juice. This waiting time is hands-off, but do set aside a chunk of time to finish the work after that.

This recipe yields just over 3 quarts, a perfect amount for a couple of pies. If you have a lot of rhubarb, don’t hesitate to double it—just be sure your pot’s big enough to handle 10 pounds of sliced fruit.

Canning rhubarb this way is ideal for quick, homemade pies. Just pour a quart into an unbaked pie crust, add a top crust, and bake.

But that’s not the only option.

Use the filling as a base for cobblers or crisps.

Warm it up a little and spoon over pound cake or ice cream for an easy dessert upgrade.

Blend with ice cream for a tangy, fruity milkshake.

Spread it on pancakes or waffles for a special breakfast treat.

Stir it into oatmeal or yogurt to brighten your morning bowl.

And don’t forget—homemade rhubarb pie filling makes a lovely gift for friends and family. It’s a delightful twist on the usual jams and jellies and can be used in so many ways.

Flavor Variations and Substitutions

This recipe focuses on rhubarb, but you can easily add other fruits to mix things up. Just keep the total fruit weight around 5 pounds. Strawberry-rhubarb combos are always a hit—just remember to cut back on sugar a bit since strawberries bring natural sweetness.

How to Store and Use

For shelf stability, can this rhubarb pie filling in a water bath canner. Like all home-canned goods, plan to use it within a year for best quality.

If you want a shortcut, freeze the filling by packing it into containers or bags with 1 inch of headspace.

Thaw frozen filling in the fridge before using. It’s best eaten within 6 months for optimal taste and texture.

I prefer canning in quart jars since one quart is just about right for a 9″ pie.

But you can also use pint jars if you want smaller portions or to share gifts.

Common Questions Answered

• Is the lemon juice necessary?

  Yes, lemon juice balances the sweetness and helps rhubarb’s pectin set up nicely. While rhubarb is naturally acidic enough for water bath canning, lemon juice enhances flavor and texture.

• Can I use regular cornstarch or flour instead of ClearJel?

  No, if you’re canning. ClearJel is specially made for pie fillings and is safe and reliable for water bath canning. You can use regular cornstarch or flour if freezing and using quickly, but they’re not recommended for sealed jars.

• How long will canned or frozen filling keep?

  Home-canned jars keep best for up to 1 year. Frozen filling is best within 6 months.

• Can I add other fruit like strawberries?

  Absolutely! Just make sure your total fruit load is around 5 pounds. If using sweeter fruit like strawberries, reduce sugar slightly.

• Can I reduce the sugar?

  Yes, but go slowly. Sugar affects taste and mouthfeel. Large sugar cuts may alter texture and shelf life, so if canning, test small changes first.

• How do I adjust processing for altitude?

  Increase water bath times per USDA or local extension advice. Follow trusted canning guidelines for your elevation and jar size.

• What jar size should I use?

  Quarts are great since one jar fills a 9″ pie. Pints work well for smaller portions or gifts.