Hammer Jam guide: when, how much discount and how to prepare
Hammer Jam is the yearly Clash of Clans event where upgrades get faster and cheaper. The 2026 event starts on 1 November and ends on 16 November. Below are the event rules, what to do to prepare, and how far each hero gets during the event.
November 2026 season calendar
Events in Supercell's published November season calendar:
| Event | Dates |
|---|---|
| Hammer Jam | 1–16 November |
| Clan War Leagues (CWL) | 1–11 November |
| Mass M.O.M.M.A.s | 9–10 November |
| Last Town Hall 18 Challenge | 9–16 November |
| Troop Spotlight | 10–17 November |
| TH19 Clash On and creator sneak peeks | 13–15 November |
| Snackable Troop Event | 20–27 November |
| Clan Games | 22–28 November |
| Fully Forged Challenge | 24 November – 1 December |
Rules
- Supercell's announcement for last year's event (1–17 November 2025): 50% reduction in upgrade time and cost, excluding Supercharges and Crafted Defenses, plus 2x resource collector capacity and production. Supercell's announcement.
- According to Supercell's November season calendar the 2026 event runs 1–16 November. The calendar does not state the discount; it is expected to be 50% like last year, so confirm the exact value in the in-game announcement. Calculations on this site assume 50% and 16 days.
- According to community guides the discount only applies to upgrades you start during the event; upgrades already running are not affected.
How to prepare
- Start long upgrades (heroes, Laboratory) during the event and finish the short ones before it, so your builders are free at the start.
- Save resources: all discounted upgrades still need gold, elixir and dark elixir.
- If you have Builder Potions, use them on long upgrades: one potion speeds up all your builders 10x for 1 hour. The Time tab of THCheck calculates how many levels you can start with your potion count.
How far do heroes get during the event?
For each hero we assume you start 10 levels below the max level (TH18). The first upgrade starts on the first day, each level starts when the previous one finishes, and the event lasts 16 days. The discount only applies to started levels; a level counts if it starts before the window ends.
| Hero | 10 levels, normal | With 50% | Started in 16 days |
|---|---|---|---|
| Barbarian King100 → 110 | 80 days | 40 days | 5 levelswithout discount 3 |
| Archer Queen100 → 110 | 80 days | 40 days | 5 levelswithout discount 3 |
| Grand Warden75 → 85 | 80 days | 40 days | 5 levelswithout discount 3 |
| Royal Champion45 → 55 | 80 days | 40 days | 5 levelswithout discount 3 |
| Minion Prince85 → 95 | 80 days | 40 days | 5 levelswithout discount 3 |
| Dragon Duke15 → 25 | 78 days | 39 days | 5 levelswithout discount 3 |
Times are raw; Gold Pass, books and Hammer are not included. See the hero pages below for each hero's full time table.
Hero pages
Barbarian King · Archer Queen · Grand Warden · Royal Champion · Minion Prince · Dragon Duke
See how many levels you can start during Hammer Jam in your own village, with your potions included.
Rates and times are based on last year's event and a community game-data package; they are unofficial and the in-game announcement may differ.