
Hammer Jam has become one of the most loved events in Clash of Clans, giving players a golden chance to push their base upgrades faster than usual. The event usually comes right before a new Town Hall release, and all signs point to the next one landing around November 2025, before the Town Hall 18 update.
If it follows the same format as before, we can expect 50% reductions in both upgrade time and resource costs for all buildings, making it the best upgrade season of the year. So, let us look in detail at how to prepare for the next Hammer Jam in Clash of Clans.
Clash of Clans: Steps to prepare for the next Hammer Jam
The last Hammer Jam in November last year, which was before the Town Hall 17 update, even came with the Goblin Builder, which made upgrades even cheaper.
While Supercell hasn’t officially confirmed all the details yet, the event’s pattern is consistent, so we should start preparing our gems saving and Clan War League (CWL) medals now. If you aren’t maxed out at Town Hall 17, this is the perfect opportunity to speed through those long upgrades.
Builder Potions and Medals shine during Hammer Jam
One of the biggest things to note is how efficient Builder Potions become during Hammer Jam. Since upgrade times are halved, every potion becomes twice as effective, giving hours of extra value compared to normal days.

In fact, during Hammer Jam, a single Builder Potion used with 7 builders can save around 126 hours of upgrade time, thanks to the calculations made by a Reddit user, so this makes it the best purchase in the CWL shop.
On the other hand, Hammers are still great, but their value drops slightly if you already use the Gold Pass, since upgrade times are already reduced. Still, for long upgrades like 14 to 15 days, hammers can save huge chunks of time.
Gems and Magic Items calculations
Builder Potions and Books of Building work at double strength because of the halved upgrade times. However, some items like the Hammer of Heroes aren’t worth spending medals on compared to others, especially if you’re rushing hero upgrades.

One fun reminder is that the Goblin Builder might return during this event, just like last time. For 40 gems a day, it is worth it. If you’re someone who doesn’t mind spending a bit of real money, then the Special Offers during Hammer Jam are hands down the best deals you can grab in Clash of Clans. These packs often bundle huge amounts of resources.
Tips to remember before Hammer Jam begins in Clash of Clans
Here are some tips to remember:
- Don’t rush upgrades right now; wait until Hammer Jam hits to make the most of your resources.
- Stock up on CWL medals and gems so you can grab Builder Potions and Books when the event begins.
- If you’re new, check out rush guides, since Hammer Jam is the best time to jump quickly through Town Halls.
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