Boulderthon Promo Codes
We've found 30 Boulderthon codes, but none are tested yet. No shopper has reported back on these yet. Start with SARA20 and tell us how it went.
| Discount | Last used | Performance | Promo code |
|---|---|---|---|
| $20 off by Fri | — | MARCHFB20 | |
| 15% off fueling products | — | BOULDERFUELED26 | |
| $20 off | — | SAVE20MAY | |
| $20 off | — | — | BOSTON20 |
| $20 off 50% off Half or Marathon | — | — | D3GLORYDAYS |
| $20 off marathon or half marathon | — | — | FTLR2026 |
| $26 off registration | — | — | FF26FOR2026 |
| 2 weeks free of Runna app | — | — | BOULDERTHONRUNNA |
| $100 off registration | — | — | TREBOU100 |
| $5 off 5k/10k | — | — | FTLR5 |
| $10 off orders of $25+ UberEats Order | — | — | BOULDER10 |
| $10 off registration for the event | — | — | ALLIE10 |
| 15% off fueling products | — | — | BOULDERFUELED15 |
| $10 off registration | — | — | NELLY10 |
| $25 off Full/Half Marathon | — | — | RUNBOULDER25 |
| 20% off Winter Run Jacket | — | — | SPRING20 |
| $20 off the 13.1 or 26.2 | — | — | RAMBLING20 |
| $25 off full and 50% off half race | — | — | 25FOR2025 |
| 30% off Cooldown | — | — | BOULDERTHON30 |
| $20 off | — | — | MARCHFB20 |
| $20 off | — | — | SAVE20MAY |
| 20% off all distances | — | — | BFCM20 |
| $5 off 5k or 10k entries | — | — | LABORDAY5 |
| $20 off marathon or half registration | — | — | ALI |
| $20 off | — | — | MOM20 |
| $10 off race entry | — | — | ELEVATE10 |
| 15% off 10K & 5K | — | — | RUNBOULDERTHON15 |
| $25 off full/half price products | — | — | RUNBOULDERTHON25 |
| $20 off marathon or half marathon | — | — | STRENGTH20 |
About this page
Introducing a more honest way to find coupon codes
Every code has a history, and we track it
Codes fail for boring reasons: they expire, they only cover one category, they only apply to a first order. Calling any of them "verified" would be a guess dressed up as a fact. We publish the chance instead, built from checkout data and shopper answers, and we track it over time.
Likely not workingMixed resultsHigh chance of working
You'll find one of these charts on every code we list, tracking how it has performed over time.
When there is nothing worth trying, we say so
When we don't think there is a working code for a store, we say so right at the top of the page, before you spend time scrolling.
Good chance right now78%
Nothing likely right now9%
A code that works at breakfast can be dead by lunch. Nobody can promise otherwise, so we don't stamp anything here as "working" or "verified". We tell you the chance of a code working instead, based on real shopper feedback and data, and when the chance is poor we say that out loud.
