Looking for the Highest THC Strain? Try These!

THC, the dominant cannabinoid in cannabis, is responsible for producing the euphoric and mind-altering effects commonly associated with marijuana. The more THC, the stronger the experience. Thanks to their unique genetics, different strains of cannabis possess different amounts of THC, terpenes and other compounds that work together to produce effects.

As genetics have become more refined through careful crossbreeding, some modern marijuana strains now possess the highest levels of THC we’ve ever seen. This has many people wondering: What is the strongest cannabis strain out there?

If you’re looking for some of the best cannabis strains for powerful cerebral euphoria or to provide relief from stubborn medical symptoms, check out our list of the highest THC marijuana strains.

Strongest Marijuana Strain: Which Should You Pick?

Godfather OG (Indica)

What do you get when you cross XXX OG and Alpha OG? Godfather OG, aka “the Don of All OGs” is here to show us. And we like what we see.

If you’re a fan of OGs, you can’t pass up on this one. Its balanced 60/40 indica-dominant genetics provide the low-key, relaxing vibes you’d expect from an OG along with some of the invigorating zazz that sativas usually reserve for themselves. You can thank its THC content, ranging from 19 to 25%, for that. Godfather OG also exemplifies the typical “OG” scent nicely, exhibiting the distinctive smell of dirt whenever you pop open its container.

Irish Cream (Indica)

This indica-dominant hybrid possesses a sweet taste and smooth, lush smoke that you’d expect from a strain called Irish Cream. A backcross of Mighty Irish Hope, Irish Cream’s indica genetics make it great for easing stress or boosting mood.

One of the reasons for this strain’s potent effects is its robust THC content, which can reach near 30%. But that’s not all. Irish Cream also frequently develops CBG as well. On its own, CBG appears to be able to relieve discomfort while simultaneously soothing upset stomachs. That’s not all, though. Thanks to the entourage effect, CBG can further enhance the already-powerful properties that this strain has.

Ghost Train Haze (Sativa)

highest thc strain 1
Source: Leafly

How potent is Ghost Train Haze? In 2012, High Times magazine declared it ‘the most potent strain on earth’. Ghost Train Haze is an 80/20 sativa that has been known to reach THC levels as high as 27%, making it very potent strain even by today’s standards.

Thanks to its highTHC levels and its sativa genetics, this cannabis strain produces one of the best stimulating, energizing, euphoric, and uplifting experiences you’ll encounter. If you’re feeling down, there’s no better pick me up! But if you are prone to anxiety or paranoia, be sure to start low and go slow with this one. 

One thing that sets Ghost Train Haze apart is its scent. No other strain in the world has quite the same combination of sweet, pungent, herbal, and spicy tones.

Trainwreck (Sativa)

highest thc strain 4

Trainwreck is an exhilarating sativa-dominant hybrid that produces an uplifting, energizing, and euphoric experience perfect for daytime smoking. This strain’s THC levels often peak at 25% and will hit you like a train, producing strong cerebral effects that often lead to laughter and energized creativity. Medical patients may also be able to benefit from Train Wreck, with some patients reporting that it’s helped them boost mood, find relief and soothe headaches.

Trainwreck comes from crossing two pure landrace sativas (Mexican and Thai), and a potent landrace indica (Afghani). Its bright green buds are known for their piney, citrusy scent, and lemony aroma.

Bruce Banner #3 (Sativa)

highest thc strain 5
Source: Seed City

There’s a good reason why this strain is named after the Hulk. Bruce Banner #3’s monstrous THC levels can reach as high as 29%, making it one of the highest THC marijuana strains you’ll find on dispensary shelves. In fact, many people claim this to be the strongest cannabis strain around. This 80/20 sativa-dominant hybrid makes an impactful first impression with immediate waves of cerebral and physical euphoria before settling into an enjoyable sense of full-body relaxation.

This powerhouse strain is a cross between legendary indica OG Kush and delicious sativa Strawberry Diesel. The final product is not only a delight for the senses but was also named to High Times’ ‘Earth’s Strongest Cannabis Strains’ list more than once. In spite of its brutish name, Bruce Banner actually has a complex and thoughtful aroma. It’s faintly floral, with a dash of sweet berries rounded out by a distinct whiff of diesel fuel.


Here’s a classic strain that can still hold its own against any of the whippersnappers on this list. Chemdawg is also a fairly mysterious strain. Its forerunners are shrouded in mystery, although it’s bestowed its genetics to other legends like Sour Diesel since it hit the scene.

Chemdawg takes its name from the strain’s pungent, powerful scent, reminiscent of chemicals or diesel fuel. But where this strain really shines is its THC content – the highest out of many old-school marijuana strains. Countless cultivators have tried their hand at Chemdawg over the decades. These many variants usually fall around 19% THC, although one shining example reached as high as 30% in a recent Cannabis Cup.

White Tahoe Cookies (Indica)

This three-way cross takes its name from its ancestors: The White, Tahoe OG, and Girl Scout Cookies. Those three legendary strains have come together to create White Tahoe Cookies, and we’re glad they did. Its THC potency regularly measures between 20% and 29%, setting it firmly in the category of highest THC marijuana strains out there. Its 70/30 indica-dominant genetics makes it perfect for anyone who wants to chill out. What’s more, indicas have a reputation for helping improve sleep.

Kosher Kush (Indica)

highest thc strain 3

Winning the High Times Indica Cup in 2010 and 2011, Kosher Kush has long been recognized as one of the  best indica cannabis strains in the world. Its genetic background is a mystery, but one thing is for sure, this strain definitely packs in the THC.

Under the right growing conditions, Kosher Kush consistently clocks in at between 20%-25% THC. Along with relaxation and euphoria, this strain is also likely to make you sleepy and hungry, making it perfect for winding down your day.

Critical Kush (Indica)

highest thc strain 2

This 90/10 indica is a cross between legendary strains OG Kush and Critical Mass. The final product is a highly relaxing indica that has been measured at over 25% THC.

Critical Kush produces a relaxing and euphoric body high accompanied by mild cerebral euphoria. Thanks to its indica genetics and high-THC levels this strain has become a favorite among medical marijuana patients. Whether you’re looking for a strain to treat specific concerns, or simply looking to take the edge off, you can’t really go wrong with Critical Kush.

Strawberry Banana (Indica)

With an incredible flavor and respectable THC content, Strawberry Banana (also known as Strawnana) secured the final spot on our list. Clocking in at about 22% THC on average, this 70/30 indica-dominant hybrid definitely deserves to make an appearance in this post.

With its indica-dominant genetics, Strawberry Banana is a great afternoon and evening smoke. It’s perfect for unwinding and relaxing, but not so tranquilizing that you need to fear couch-lock. 

You can grab the strongest marijuana strain at your favorite Des Moines or Seattle Dispensary. Check our online menus to see what’s available.

Find the Best High THC Strains at Greenside Recreational

We hope this list of popular high-THC strains helped stimulate your curiosity, so be sure to check out our Seattle or Des Moines online menus for more potent flower options or stop by one of our locations in person to talk to our budtenders—they will always be able to point you in the direction of potent strains. We look forward to serving you!

Queen Anne location now open! Visit us today at 523 Queen Anne Ave N, Seattle, WA