Pre-Rolls Explained
A pre-roll is flower that has already been rolled into a paper, cone or blunt wrap, so you can light it as it comes. This guide covers what the package tells you and what research exists on how pre-rolls keep, and it points to a page for each common question.
What the package shows
A flower package must show the date it was packaged(CMR label rule).
It must also show a batch number that identifies the batch the flower came from(CMR label rule).
The label must give the net weight or volume in U.S. customary and metric units(CMR label rule).
The package must also carry a statement and seal that the product has been tested for contaminants(CMR label rule).
This label rule is written for flower sold as flower. It does not name pre-rolls, so this guide does not claim it applies to them word for word. The weight, the package date and the batch number are still the three things worth reading on any pre-roll.
What research exists
One research team stored cannabis flower in the dark at four temperatures and analyzed it over a year.
One study tested terpene-infused pre-rolled cone paper under light intensities from 200 to 1500 lux for 24 h(cone-paper study).
That second study used cone paper with terpenes added, and not a finished pre-roll with flower in it. We did not find a study of how long a finished pre-roll keeps. Each guide here says which statement comes from a study and which is our own handling advice.
What AC makes
AC's own product list shows 1 gram pre-rolls, packs of 0.5 gram pre-rolls and a 1.5 gram blunt on some strains. Stock changes from week to week, so check the strain list or ask the store.
Short answers
How much is in a pre-roll?
A flower label must give the net weight or volume in U.S. customary and metric units, listed in that order(CMR label rule).
Does a pre-roll have an expiration date?
The flower label rule lists a package date and a batch number and no use-by date. The rule does not name pre-rolls, so check the package itself.
Are pre-rolls tested in Massachusetts?
Massachusetts requires marijuana to be tested for contaminants. The label rule names a tested seal. Ask the store for the batch number to look up the lab report.
Keep reading
- Pre-Roll Sizes in Grams
- Half Gram vs 1 Gram Pre-Roll
- How Long Do Pre-Rolls Last?
- How to Store Pre-Rolls
- How to Fix a Canoeing Joint
- COA library: the lab report for each AC strain
- All AC guides
Sources
- Cornell Legal Information Institute, 935 CMR 500.105, General Operational Requirements for Marijuana Establishments (read November 5, 2026): "The date that the Marijuana Establishment packaged the contents and a statement of which Licensee performed the packaging;"
- Cornell Legal Information Institute, 935 CMR 500.105, General Operational Requirements for Marijuana Establishments (read November 5, 2026): "A batch number, sequential serial number, and bar code when used, to identify the batch associated with manufacturing and Processing;"
- Cornell Legal Information Institute, 935 CMR 500.105, General Operational Requirements for Marijuana Establishments (read November 5, 2026): "Net weight or volume in U.S. customary and metric units, listed in that order;"
- Cornell Legal Information Institute, 935 CMR 500.105, General Operational Requirements for Marijuana Establishments (read November 5, 2026): "A statement and a seal certifying that the product has been tested for contaminants, that there were no adverse findings, and the date of testing"
- Karangan et al., “Surroundings Impact on Terpene Stability in Terpene-Infused Pre-Rolled Cones,” Journal of Fluid Flow, Heat and Mass Transfer 11 (2024) (read November 5, 2026): "the terpene-infused pre-rolled cone paper was placed in a device with light intensity variations of 200, 300, 600, 900, 1200, and 1500 lux for 24 h"