The Black Friday of Clash of Clans: Hammer Jam

If you are a Clash of Clans player, you know the struggle: staring at a wall that costs 7 million Gold, or waiting 14 days for an X-Bow to upgrade. It’s a grind.

But every once in a while, the Clash gods (Supercell) bless us with the single best event in the game: Hammer Jam.

If you have heard clanmates whispering about saving their Magic Items or hoarding Gold, this is why. Here is your complete guide to what Hammer Jam is and when you can expect it to drop.

1. What is Hammer Jam?

Think of Hammer Jam as the "Black Friday" or "Prime Day" for your Home Village. It is a limited-time event designed to help you upgrade your base at lightning speeds.

While the specific perks can tweak slightly from year to year, the core of Hammer Jam always revolves around massive discounts.

The Big Perks

• 50% Building Cost Reduction: This is the headline feature. Every building, trap, and—most importantly—Wall costs 50% less Gold, Elixir, or Dark Elixir.
• 50% Time Reduction: In recent events, Supercell has also slashed upgrade timers by half. That 14-day upgrade? It’s now 7 days.
• Hero Upgrades: Often included in the 50% cost/time reduction (though this can vary by specific event, it has become a standard expectation).

Why It’s a Big Deal

During Hammer Jam, you can essentially do two walls for the price of one. It is the only time of year where you can max out an entire level of walls in just a couple of weeks if you farm hard enough.

2. When Does Hammer Jam Usually Happen?

Unlike seasonal events (like Clash-O-Ween or the Christmas events), Hammer Jam does not happen at the same time every year. Instead, it is tied to the game's development cycle.

The Golden Rule: "Before a New Town Hall"

Hammer Jam is almost exclusively a pre-update hype event. It occurs immediately before the release of a new Town Hall level.

• The Pattern: Supercell releases a new Town Hall roughly every 12 to 18 months.
• The Signal: When you start seeing teasers for a new Town Hall level (e.g., TH16, TH17, etc.), Hammer Jam is usually the first phase of that launch.
• Duration: The event typically lasts for 12 to 14 days.

Why Do They Do This?

It’s a catch-up mechanic.

• For Maxed Players: It allows them to burn overflowing resources before the new update drops.
• For Lower Players: It helps them rush through upgrades to get closer to the new content so they aren't left behind.

3. How to Prepare (The Strategy)

Since we know Hammer Jam comes before a new Town Hall, you can actually prepare for it.

• Hoard Magic Items: Save your Builder Potions. Since upgrade times are halved, a Builder Potion effectively gains double the value during the event.
• Plan Your Builders: Try to time your long upgrades so that your builders become free exactly when the event starts. You don't want to be stuck in a 15-day upgrade when the 50% discount drops!
• Keep One Builder Free: During the event, farm as much as possible and dump all excess Gold/Elixir into Walls with a free builder. This is the most efficient way to play the event.

Summary

Feature	Details
What is it?	A massive event with 50% off building costs and (usually) times.
Best Use?	Grinding Walls and expensive defenses.
When is it?	Immediately before a New Town Hall release.
Frequency	Roughly once every 12 months (dependent on update cycle).