Here's How Long to Grill Asparagus in Foil!

Grilling asparagus in foil is one of the easiest ways to make this green veggie taste great.

It keeps the spears tender, juicy, and full of flavor.

But the most common question people ask is simple:

How long should you grill asparagus in foil?

The short answer is 10 to 15 minutes.

The full answer depends on heat, thickness, and how you like it cooked.

This guide explains it all in a clear and simple way.

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How Long to Grill Asparagus in Foil

When grilling asparagus in foil, timing matters more than anything else.

On a medium grill (375–400°F), asparagus wrapped in foil takes:

• 10 minutes for thin spears

• 12–15 minutes for thick spears

Turn the foil packet once halfway through cooking; this helps the asparagus cook evenly on both sides.

If the grill is hotter than medium, check at the 8-minute mark.

If it is cooler, it may need a few more minutes.

The asparagus is done when:

• A fork slides in easily

• The color is bright green

• The tips are soft but not mushy

If you’re also interested in grilling asparagus directly on the grates, this guide on How to Grill Asparagus? 5 Easy Steps walks through a simple method without foil.

Why Grill Asparagus in Foil?

Foil grilling is popular for a reason.

It helps asparagus:

• Cook evenly

• Stay moist

• Avoid burning

• Hold seasoning better

Foil also keeps small pieces from falling through the grates; that makes it great for outdoor grills of all kinds.

This method works well for gas grills, charcoal grills, and pellet grills.

Some grillers also prefer using baskets for vegetables, and if you enjoy that approach, learning How to Use a BBQ Basket Grill Like a Pro (And Why You’ll Love It) can be a helpful next step.

Best Grill Temperature for Foil-Wrapped Asparagus

Medium heat is best.

Set your grill to 375–400°F before placing the foil packet on the grates.

If the grill is too hot, the asparagus can steam too fast and turn soft.

If the grill is too cool, it can taste flat and undercooked.

Keep the lid closed while grilling; this helps keep the heat steady and cooks the asparagus faster.

Does Thickness Change Grilling Time?

Yes, thickness makes a big difference.

Thin asparagus cooks faster.

Thick asparagus takes longer.

Always try to use spears that are close in size.

If you mix thin and thick spears, some will overcook while others stay raw.

For best results:

• Trim the woody ends

• Group similar sizes together

• Lay them in a single layer inside the foil

This helps everything cook at the same speed.

How to Tell When Foil-Grilled Asparagus Is Done

Time is a guide, but texture is the real test.

Carefully open the foil packet and check one spear; be careful of hot steam.

Perfect asparagus should be:

• Tender but still firm

• Easy to bite

• Not limp or gray

If it needs more time, reseal the foil and grill for 2–3 more minutes.

Common Mistakes When Grilling Asparagus in Foil

Many people overcook asparagus without knowing it.

Here are a few things to avoid.

Do not grill on high heat; high heat causes steaming instead of grilling.

Do not stack asparagus too thick; thick piles cook unevenly.

Do not forget to turn the packet; one side can cook faster than the other.

Do not leave the foil open; this lets moisture escape and dries the asparagus out.

Small changes make a big difference in taste and texture.

Can You Grill Asparagus in Foil Ahead of Time?

Yes, but it tastes best fresh off the grill.

If needed, you can grill asparagus in foil up to one hour ahead. 

Keep it wrapped and warm.

Open the foil just before serving.

Reheating on the grill is not ideal; it can make the asparagus soft. 

If reheating is needed, use low heat for a short time.

What to Do After Grilling

Once the asparagus is done, remove the foil packet from the grill and let it rest for one minute.

After that, your grill grates may have bits of seasoning or food left behind.

Cleaning the grill while it is still warm makes the job easier.

Many grill owners prefer a bristle-free option like the Easy Function Wood Grill Scraper.

It cleans hot grates without metal bristles and is safe for all grill types.

It fits well into a simple grilling routine, especially after cooking vegetables in foil.

Buy Easy Function Wood Grill Scraper - Amazon USA

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Final Answer: How Long to Grill Asparagus in Foil?

To sum it up:

• Grill asparagus in foil for 10 to 15 minutes

• Use medium heat (375–400°F)

• Turn the foil packet once

• Check for fork-tender texture

This method gives you tender, flavorful asparagus every time, with very little effort.

If you want to make grilling easier from start to finish, you can click the image to check out our products, or explore our full range of grilling tools designed to keep cooking simple and stress-free.

P.S. We regularly publish new recipes and grilling tips. Here’s the most recent one: Here’s How to Check Steak Temperature Without Thermometer