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    Home » Garden To Table » Winter Squash

    Autumn Frost Squash Pasta Sauce

    Published: Jan 2, 2026 · Modified: Jan 14, 2026 · Leave a Comment

    This post contains affiliate links. As an Amazon Associate I earn from qualifying purchases.

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    This vegetarian autumn frost squash pasta sauce is made with roasted squash and onion, milk, and butter for an easy fall béchamel sauce. Serve it with your favorite pasta!

    Bowl of autumn frost squash pasta sauce.

    Winter squash season is wonderful. Some times I walk out of the grocery store with a hybrid that's new to me, and then it's like discovering all over again just how tasty these squash can be.

    If you've happened upon some autumn frost squash and are wondering what to do with it, this squash pasta sauce is a delicious and easy option with only a few ingredients!

    What is Autumn Frost Squash?

    It's a variety of winter squash that's similar to butternut squash, but with a thinner skin. I found some at Trader Joe's this winter.

    Several autumn frost squash.
    Autumn Frost Squash

    It's also not as big as butternut squash, so great for if you're cooking for just a couple people and don't need leftovers.

    Can I Substitute a Different Winter Squash?

    Yes! This recipe will work well with either butternut squash or honeynut squash. I also love using acorn squash for a similar winter squash pasta sauce.

    How to Use Squash Pasta Sauce

    We love using winter squash pasta sauce in lots of recipes! You could substitute this sauce for the ones used in this acorn squash pasta with kale and this butternut squash lasagna.

    You can, of course, simply use it along with your favorite pasta for an easy peasy meal.

    How to Make Autumn Frost Squash Pasta Sauce

    Start by cutting up the squash and onions into quarters. Scoop out the squash seeds, and then roast the squash and onions on a baking sheet or pan with olive oil and seasonings.

    I use a Lodge 12" carbon steel skillet.

    Pieces of cut autumn frost squash arranged in skillet with onion and seasoning.

    Cook the veggies until they are tender. It may take around a half-hour. Then let them cool for a few minutes for easier handling.

    At this point, you could stop and refrigerate or freeze the squash and onions if you're just prepping the recipe for later.

    Pieces of autumn frost squash and onion after roasting.

    To continue making the sauce, scrape the cooked squash out of the peel and blend it along with the onions and milk.

    Blend Squash + Onion with Milk
    Blend Squash + Onion with Milk

    Next, add butter to a saucepan over medium heat. Once melted, add flour to the butter and whisk until smooth.

    Pour the blended squash mixture into the pan, and cook it, while stirring, for a couple of minutes.

    Whisk Squash Into Butter + Flour
    Whisk Squash Into Butter + Flour

    Finally, stir in the wine vinegar. It's ready to serve — hopefully with your favorite pasta and a little cheese!

    Bowl of autumn frost squash pasta sauce.
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    Autumn Frost Squash Pasta Sauce

    This vegetarian autumn frost squash pasta sauce is made with roasted squash and onion, milk, and butter for an easy fall béchamel sauce. Serve it with your favorite pasta!
    Author: Sarah Trenalone
    Prep Time5 minutes mins
    Cook Time40 minutes mins
    Total Time45 minutes mins
    Course: Meal Prep
    Cuisine: American, French
    Diet: Gluten Free, Vegetarian
    Servings: 6 people (½ cup servings)
    Calories: 175kcal
    Freezer Friendly?
    No
    Will It Keep?
    4 Days (Fridge)
    Prevent your screen from going dark

    Equipment

    • blender (I use this one)

    Ingredients

    • 2 pounds Autumn Frost squash, halved with seeds + membrane removed Or use butternut squash or honeynut squash
    • 1 onion, peeled + cut into wedges
    • 2 tablespoons olive oil
    • 1 teaspoon sea salt
    • 1 teaspoon paprika
    • 1 teaspoon red chili flakes
    • ¼ teaspoon nutmeg, freshly grated
    • 1 cup milk
    • 2 tablespoons butter
    • 1 tablespoon flour Use gluten-free AP flour if needed
    • ¼ ounce wine vinegar

    Instructions

    • Preheat oven to 400°F.
      Quarter squash. Remove and discard seeds and membrane.
      Place squash + onions on a baking sheet or oven-safe pan in a single layer. With squash flesh-side up, drizzle oil over squash and onions. Sprinkle with salt, paprika, chili flakes and nutmeg.
      Roast 35-40 minutes or until tender.
      Pieces of autumn frost squash and onion after roasting.
    • After cooking, carefully scoop the squash out of the peel. (You may need to allow the squash to cool down for a few minutes.)
      Add half the vegetables and all the milk to a blender basin. Blend until creamy. Add the remaining veggies and blend again.
      Blend Squash + Onion with Milk
    • Add butter to a large pan and melt over medium heat. Whisk in the flour until it is completely absorbed by the butter.
      Whisk Flour into Melted Butter
    • Add the puréed squash to the pan with the butter. Cook over medium heat for about two minutes, stirring often, and then remove from heat. Stir in the vinegar.
      Serve immediately along with fresh pasta or refrigerate and use within four days.
      Whisk Squash Into Butter + Flour

    Notes

    Yields about 3 cups sauce.
    Prepare Ahead: The squash and onion can be roasted and refrigerated up to two days before preparation or frozen for up to three months.  If freezing, thaw before continuing with the recipe.

    Nutrition

    Calories: 175kcal (9%) | Carbohydrates: 21g (7%) | Protein: 3g (6%) | Fat: 10g (15%) | Saturated Fat: 4g (25%) | Cholesterol: 14mg (5%) | Sodium: 450mg (20%) | Potassium: 619mg (18%) | Fiber: 3g (13%) | Sugar: 3g (3%) | Vitamin A: 1002IU (20%) | Vitamin C: 18mg (22%) | Calcium: 100mg (10%) | Iron: 1mg (6%)
    Tried this recipe?Leave a comment and rating below!

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    About Sarah Trenalone

    Sarah is the primary creator at Champagne Tastes. She's a photographer, food writer and traveler, and is certified in Backcountry Kitchen and Backcountry Navigation from the Colorado Outward Bound School and Identifying Wild Plants from Backpacker.

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    bio

    Hi, I'm Sarah! I'm a traveler who loves to eat.   Follow along to join me on my next adventure-- in food or on the road.

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