4/20 is the cannabis industry's highest-volume sales day of the year. You already know that. What most dispensary operators don't have is the dispensary 4/20 sales data to back up their preparation.
Most operators handle 4/20 the same way every year: order more of everything, schedule extra staff, run a discount, hope the shelves last. That's a plan. It's not a good one.
The operators who consistently win 4/20 — who sell through without running out, maintain margin on their best movers, and convert holiday traffic into long-term customers — are using data. Here's what it shows.
What 4/20 Does to Your Sales Volume
4/20 isn't just a busy day. It's a categorically different operating environment.
Most dispensaries see transaction volume significantly higher than any other day of the year — often multiple times a typical weekend day. The spike is sharp: it starts the night before, peaks in the late morning and early afternoon, and tapers by evening. You're not managing a busy day. You're managing a compressed surge.
What changes most isn't just volume — it's how customers buy. Basket sizes increase. Customers who normally buy one or two items stretch to four or five. First-time buyers show up. Customers who only come in once or twice a year make this one of their visits.
That last group is important. 4/20 has unusually high first-visit and lapsed-customer traffic. The customers walking through your door on April 20th aren't all your regulars. That affects what sells, what doesn't, and what you should have on hand.
Which Categories Win on 4/20
Flower is the consistent leader. It's the highest-volume category on 4/20 by a wide margin — for most dispensaries, flower drives more than half of total 4/20 revenue. If you run out of your best-selling flower SKUs before 2 PM, the day doesn't recover.
Pre-rolls are the fastest-growing 4/20 category. The convenience purchase for first-timers, the easy gifting option, the format that requires no equipment — pre-rolls punch above their weight on holidays. If pre-rolls aren't already a major part of your 4/20 purchasing plan, look at your sell-through data from last year.
Vapes perform well with premium shoppers. Concentrates see strong demand from experienced consumers who show up specifically for 4/20 deals on higher-margin products. Edibles move as convenience and gifting items.
Here's the important caveat: your category mix will reflect your specific market, customer base, and location. California dispensaries see different patterns than Michigan dispensaries. Urban locations see different patterns than suburban ones. The industry-level data is a starting point. Your own POS history is the answer.
If you don't have a way to slice your own category performance by date, you're relying on what worked for someone else's dispensary — not yours.
The Discount Trap
Discounting on 4/20 is nearly universal. Industry data shows approximately 84% of transactions on 4/20 include some form of discount. That's not a 4/20 strategy — that's an industry reflex.
The problem: 4/20 is your highest-demand day of the year. You have pricing power you're giving away.
Blanket discounting on 4/20 means you're applying your deepest discounts exactly when demand is highest — the opposite of rational pricing. You're training customers to wait for the best deals. And you're compressing margin on the day that has the highest absolute dollar impact on your monthly P&L.
The data-backed alternative: discount strategically.
Discount on slow-moving SKUs you need to clear before they age out. Discount on items where the deal genuinely drives trial — a customer who wouldn't otherwise buy that edible brand. Don't discount your top-velocity flower SKUs. You'll sell them anyway. Every point of margin you protect on your best movers goes straight to the bottom line.
Check your purchasing KPIs before you build the discount plan. Which SKUs have the strongest sell-through at full price? Those are your protected margin items. Which have been sitting for 30+ days? Those are your discount candidates.
How to Read Your Dispensary's 4/20 Sales History
The best prediction for your 4/20 performance is your actual 4/20 history.
Pull your POS data from the last one or two 4/20 periods. If you have it, pull the week before and the week after as well — the pre-4/20 run-up and post-holiday dip tell you as much as the day itself.
What to look for:
Category mix. What percentage of revenue came from each category? Did that mirror your normal category breakdown, or did certain categories over- or underperform relative to their usual share?
Peak hours. When did transactions peak? When did you start running out of things? A sellout at 11 AM means you under-purchased. A full shelf at 7 PM means you over-purchased in that category.
SKU-level velocity. Which specific SKUs sold out? Which didn't move even with a discount? That's your purchasing signal for this year.
Basket size and transaction count. Did your average basket grow, or did you just do more transactions at your usual basket size? Both tell you different things about customer behavior.
First-time customer rate. Most POS systems can tell you how many customers were first-time visitors. If you don't know this number, you're missing one of the most important insights from your biggest day.
If you can't answer these questions from your existing reporting, you have a data problem that goes beyond 4/20.
Building Your 4/20 Purchasing Plan
With your historical data in hand, building the purchasing plan becomes a math problem, not a guessing game.
Order timeline. For your highest-velocity SKUs, lock in orders three weeks out. Flower, pre-rolls, and top-selling vapes sell out at distributors before 4/20. If you're placing orders the week before, you're competing with every other dispensary in your market for the same limited supply.
Volume multiplier by category. Look at your historical 4/20 daily sales versus your average daily sales in that category. That ratio is your multiplier. Apply it to your current average daily sales to get your 4/20 order target. Round up, not down — stockouts cost more than overstock on your highest-margin day.
Backup vendors. For your top five SKUs, identify at least one secondary vendor. If your primary supplier runs short, you need a fallback order ready to place. This is not optional on high-demand holidays.
Safety stock buffer. Order 15–20% more than your data predicts for categories where stockouts are high-cost (flower, pre-rolls). You can run end-of-day discounts to clear the buffer. You can't manufacture more product at 3 PM when you're sold out.
Post-4/20 Analysis: What to Track
4/20 data is some of the most valuable data your dispensary generates all year. Most operators look at the revenue number and move on. Don't.
What sold out, and when. Sellouts reveal suppressed demand. If a SKU sold out by noon, your actual demand was higher than your orders. That's a signal for your next high-volume day and for your year-round purchasing strategy.
What didn't move. If a SKU sat through 4/20 even with a discount, it's a problem SKU. The highest-traffic day of your year should move slow inventory. If it didn't, the SKU has a positioning problem, not just an inventory problem.
Customer acquisition. How many first-time buyers came through? What did they buy? Did they return within 30 days? 4/20 is your highest-traffic acquisition event. Tracking conversion to repeat visitors tells you the actual value of the day — not just revenue, but customer lifetime value.
Margin by category. Your total 4/20 revenue looks good. Your margin by category may tell a different story. Which categories protected margin and which got squeezed by discounting? Use that to recalibrate next year's discount strategy.
All of this lives in your POS data. The question is whether you can see it.
What Chapters Data Shows You
Chapters Data connects directly to your Treez POS and surfaces exactly this analysis — category performance, SKU velocity, basket size trends, first-time customer rates, and sell-through by product.
You can pull your last 4/20 data today and have your purchasing plan built before April 14th.
Frequently Asked Questions
When does 4/20 search traffic peak? Search demand for 4/20 dispensary deals, hours, and specials typically peaks 5–7 days before April 20th. If you want to capture that traffic, your promotional content and inventory need to be in place by April 13–14th at the latest.
How far in advance should I order for 4/20? Three weeks out is the minimum for your top SKUs. Flower and pre-rolls from popular brands sell through at distributors before the holiday. Late orders in the final week before 4/20 often come back short or substituted.
Should I discount on 4/20? Strategically, yes. Universally, no. Discount on SKUs you need to move, and on items where the deal drives genuine trial. Protect margin on your highest-velocity movers — you'll sell them regardless.
What does 4/20 data tell me about the rest of my year? A lot. Sellouts reveal suppressed demand in categories worth stocking heavier year-round. First-time customer data reveals acquisition channels worth investing in. Category mix tells you whether your everyday assortment matches what customers actually want on your biggest demand day.
What if I don't have historical 4/20 data? Start building it this year. Track your hourly transaction volume, category breakdown, SKU-level sellouts, and first-time customer rate. Even one year of data transforms how you plan next April.
Chapters Data is a cannabis retail analytics platform that connects to your Treez POS and turns raw transaction data into purchasing intelligence. Request a demo at chaptersdata.com/contact.
