Flower sold as high THC tests between 20% and 30% THC. A small group of strains tests above 30%. The number on the package is a lab result from one sample. It is not a dose.
What a THC percentage means
One gram of flower at 25% THC holds 250 mg of THC. The same gram at 20% holds 200 mg. Combustion and vaporization destroy part of that total, so the inhaled dose lands under the label number. In most US states with limits, one edible serving holds 10 mg of THC. That equals about 40 mg of 25% flower by weight.
Strain names and common lab ranges
Ranges below come from public strain databases and state-licensed lab reports. Grower, batch, and lab change the result. Two samples of the same clone can differ by several points.
- Gorilla Glue #4 (GG4): 25% to 28%
- Bruce Banner: 24% to 29%
- Ghost Train Haze: 25% to 27%
- Wedding Cake: 24% to 27%
- Do-Si-Dos: 25% to 30%
- GMO Cookies (Garlic Cookies): 26% to 30%
- Runtz: 24% to 29%
- MAC (Miracle Alien Cookies): 25% to 30%
- Permanent Marker: 28% to 32%
- Chemdawg: 20% to 25%
Names carry no legal weight. A breeder name and a dispensary label can point to different genetics. Check the harvest date and the lab name printed on the package.
Labels and lab variance
Colorado requires potency testing at licensed labs and THC content on the label. Other states run similar programs. Even so, peer-reviewed studies found labeled THC content differs from measured content in some products. A 2021 review of flower samples found gaps of a few points between label claims and independent tests. Lab methods differ, and so do results for one sample sent to two labs.
Concentrates run higher
Concentrates sit above flower. Live resin and shatter land between 60% and 85% THC. Distillate can reach 90% or more. High THC flower tops out near 35% in published reports.
Convenience and the number on the shelf
Pre-rolls, vape carts, and delivery changed how people buy. None of these formats need a grinder, papers, or cleanup. The THC percentage is the fastest comparison on a menu, so shoppers sort by that single number. Public data on how much convenience drives that choice is limited. State traceability systems track sales, not reasons. THC content also does not predict the effect for one person. Dose, tolerance, route, and terpene content all matter. A 20% strain smoked in three draws can hit harder than a 30% strain in one.