The Zcash network is steadily counting down to its next major supply event: the third halving, expected to occur at block 4,406,400 in approximately November 2028. When that block is mined, the per-block subsidy will drop from 1.5625 ZEC to 0.78125 ZEC, a 50 percent reduction that will reshape the economics of every Equihash mining operation on the planet.

Whether you already run Antminer Z15 Pro units or you are evaluating Zcash mining for the first time, understanding the halving cycle is critical for making informed hardware and hosting decisions today. This guide covers what the halving is, when it will happen, how it impacts profitability, and the concrete steps miners should take before the block reward is cut in half.

What Is a Zcash Halving?

A halving is a pre-programmed event written into the Zcash protocol that cuts the number of new ZEC created per block by exactly 50 percent. The mechanism is intentionally deflationary: by reducing the rate at which new coins enter circulation, halvings ensure that Zcash’s total supply approaches its hard cap of 21 million ZEC in a controlled, predictable curve.

Zcash inherited this design from Bitcoin but adapted it for its own network parameters. After the Blossom network upgrade in October 2019, Zcash’s block time was shortened from 150 seconds to 75 seconds. To compensate, the per-block subsidy was halved so that the overall emission rate per unit of time remained unchanged. In practical terms, the network now produces blocks twice as fast, each carrying half the reward of the old schedule.

The halving interval, measured in equivalent pre-Blossom block heights, is 840,000 blocks. Converted to post-Blossom actual block heights, each halving cycle spans approximately 1,680,000 blocks, which at 75 seconds per block works out to roughly four years of real time.

Zcash Halving History: A Timeline

Understanding where we are requires understanding where we have been. The Zcash block reward has been reduced twice already, and the pattern repeats like clockwork:

• Genesis (October 2016): Zcash launched with a block subsidy of 12.5 ZEC per block at 150-second intervals. After the slow-start mining period, full rewards began flowing to miners and the Founders’ Reward fund.
• Blossom Upgrade (Block 653,600 — October 2019): Block time was cut to 75 seconds, and the per-block subsidy was adjusted to 6.25 ZEC. The total emission per hour remained the same; blocks simply arrived twice as frequently at half the individual reward.
• First Halving / Canopy (Block 1,046,400 — November 2020): The block subsidy dropped from 6.25 ZEC to 3.125 ZEC. The Canopy upgrade also replaced the Founders’ Reward with a new development fund structure allocating 20 percent of the block subsidy to the Zcash ecosystem (Major Grants Fund, Electric Coin Company, and Zcash Foundation).
• Second Halving (Block 2,726,400 — November 2024): The subsidy was cut again to 1.5625 ZEC per block. This is the current reward level. Combined with the NU6 upgrade’s lockbox mechanism, approximately 1.375 ZEC per block flows to miners and fund recipients, with a small portion directed to a deferred reserve pool.
• Third Halving (Block 4,406,400 — Estimated November 2028): The subsidy will drop to 0.78125 ZEC per block. This is the event miners need to begin preparing for now.

When Exactly Will the Third Halving Happen?

As of late September 2026, the Zcash blockchain has reached approximately block 3,494,750. The third halving is triggered at block 4,406,400, which means roughly 911,650 blocks remain. At the target rate of one block every 75 seconds, that translates to approximately 791 days, placing the estimated halving date around November 2028.

Keep in mind that this is an estimate. Actual block times fluctuate with network hashrate changes and difficulty adjustments. The date could shift by several weeks in either direction, but the block height is fixed and immutable. Block 4,406,400 is the trigger, period.

How the Halving Affects Mining Profitability

The mathematics of a halving are brutally simple: miners receive half as many coins per block while their electricity and hardware costs remain the same. If nothing else changes, every miner’s revenue is cut in half overnight.

But something else always changes. Halvings have historically been catalysts for significant market dynamics:

Supply Shock and Price Response

Every halving reduces the daily supply of newly minted ZEC entering the market. Before the current (second) halving, approximately 3,600 ZEC per day was generated. After it, that number dropped to 1,800 ZEC per day. The third halving will reduce daily issuance to roughly 900 ZEC.

Reduced new supply, against steady or growing demand, creates upward price pressure. While past performance is never a guarantee, both Bitcoin and Zcash have historically experienced significant price appreciation in the 12 to 18 months surrounding halving events. ZEC is currently trading near $1,500, and miners who position themselves before the supply shock stand to benefit if the pattern repeats.

Hashrate and Difficulty Adjustment

When revenue per block drops, less efficient miners are forced offline. Their departure reduces the total network hashrate, which in turn causes the mining difficulty to decrease. For miners who remain operational, the lower difficulty means they win a larger share of the reduced block rewards. This self-correcting mechanism ensures that mining remains viable for the most efficient operators even after a halving.

The current Zcash network hashrate sits around 31 GS/s (gigasols per second). After the third halving, expect a period of hashrate decline as marginal miners exit, followed by stabilization as difficulty adjusts and, potentially, price recovery attracts new participants.

The Efficiency Equation

Post-halving survival comes down to one number: your cost to mine one ZEC. Miners with the lowest cost per coin will remain profitable while competitors are squeezed out. The two biggest levers you can pull are hardware efficiency and electricity cost.

The Antminer Z15 Pro: Built for Halving Survival

The Bitmain Antminer Z15 Pro is currently the most powerful Equihash ASIC miner available. Its specifications make it the machine of choice for miners planning to operate through and beyond the 2028 halving:

• Hashrate: 840 KSol/s — the highest Equihash hashrate on the market
• Power Consumption: 2,780W at the wall
• Efficiency: 3.31 J/KSol — industry-leading power efficiency for Equihash mining
• Algorithm: Equihash (mines Zcash, Pirate Chain, Komodo, and other Equihash coins)
• Cooling: Dual-fan air cooling, 75 dB operating noise

Efficiency is the Z15 Pro’s defining advantage. At 3.31 joules per kilosol, it extracts more hashing power from every watt of electricity than any competing Equihash miner. When the block reward is halved in 2028, that efficiency gap between the Z15 Pro and older hardware becomes the difference between profit and loss.

At Rax Mining, the Z15 Pro is available through our Buy & Host program at $5,099, which includes the hardware ($4,499), professional setup, configuration, and a $600 hosting onboarding fee. Hosting rates start as low as $0.075/kWh for enterprise-scale operations.

Why Electricity Cost Is Your Biggest Halving Hedge

After a halving, the single most important factor determining whether a miner stays profitable is the cost of electricity. Consider the math: if a Z15 Pro consumes 2,780W continuously, that is 66.72 kWh per day. At different electricity rates, your daily power cost looks like this:

• $0.075/kWh (Rax Mining Enterprise): $3.67 per day
• $0.075/kWh (Rax Mining Professional): $5.00 per day
• $0.085/kWh (Rax Mining Starter): $5.67 per day
• $0.10/kWh (cheap residential): $6.67 per day
• $0.15/kWh (average US residential): $10.01 per day

The difference between enterprise hosting at $0.075/kWh and average residential power at $0.15/kWh is $6.34 per day, per machine. Over a year, that is $2,314 saved per Z15 Pro. Over the two years between now and the halving, that is $4,628 in additional margin that can offset the eventual revenue reduction.

Rax Mining’s NatGas MDU (Mining Data Unit) facilities achieve their low rates through on-site natural gas power generation. These self-contained, rapidly deployable units operate independently of the electrical grid, drawing power directly from natural gas sources. The result is stable, predictable pricing that does not fluctuate with retail electricity markets.

What Miners Should Do Now to Prepare

The halving is still roughly two years away, which gives miners a meaningful window to optimize their operations. Here is a practical checklist:

1. Upgrade to Efficient Hardware

If you are running older Equihash miners (Z9, Z11, Z15 non-Pro), their higher power consumption per kilosol will make them unprofitable sooner after the halving. The Z15 Pro at 3.31 J/KSol gives you the widest profitability margin. Upgrading now means two years of more efficient mining before the reward cut, maximizing your pre-halving coin accumulation.

2. Lock In Low Electricity Rates

Your electricity rate is a fixed cost that directly determines your break-even ZEC price. Moving to a professional hosting facility with rates between $0.055 and $0.085 per kWh dramatically extends your profitability zone post-halving. Home mining at residential rates becomes increasingly risky as block rewards shrink.

3. Accumulate ZEC Before the Supply Shock

If you believe the halving will drive ZEC prices higher (as halvings have historically done for proof-of-work coins), then mining and holding ZEC in the pre-halving period lets you accumulate at current reward levels. After the halving, the same hashrate produces half the coins. Every ZEC mined today at 1.5625 per block is worth twice the post-halving mining output.

4. Diversify Across Equihash Coins

The Z15 Pro mines any Equihash-based cryptocurrency, not just Zcash. Pirate Chain (ARRR) and Komodo (KMD) are alternative Equihash coins that may offer better short-term returns depending on market conditions. Having the flexibility to switch between coins based on profitability gives you an additional edge.

5. Monitor Network Hashrate Trends

As the halving approaches, watch the network hashrate closely. If significant hashrate drops off in anticipation, your existing machines will capture a larger share of remaining rewards. Conversely, if hashrate remains stable, it signals strong miner confidence in post-halving price appreciation.

Zcash’s Privacy Premium and Long-Term Value Proposition

Zcash occupies a unique position in the cryptocurrency landscape as the pioneer of zero-knowledge proof technology for private transactions. While Bitcoin transactions are fully transparent on its public ledger, Zcash offers shielded transactions that encrypt sender, receiver, and amount data while still allowing the network to verify transaction validity.

This privacy technology has real-world demand. As regulatory frameworks evolve globally and institutional awareness of financial privacy grows, Zcash’s technical capabilities position it as a critical piece of cryptocurrency infrastructure. The Zcash Foundation and Electric Coin Company continue to develop the protocol, with recent upgrades improving the efficiency of shielded transactions and expanding the network’s capabilities.

For miners, this ongoing development and institutional interest represent a fundamental value thesis: Zcash is not just another altcoin competing on price speculation. It solves a real problem (financial privacy) with production-grade technology (zero-knowledge proofs) that has been validated over nearly a decade of mainnet operation. That utility-driven demand can provide price support independent of broader market cycles.

The Rax Mining Advantage for Zcash Miners

Surviving and thriving through a halving requires operational excellence. Rax Mining’s hosting infrastructure is engineered specifically for this purpose:

• Electricity rates from $0.075/kWh: Enterprise-tier pricing through natural gas powered facilities that are insulated from grid price volatility
• 98.6% uptime guarantee: Every minute of downtime is lost revenue. Redundant infrastructure and 24/7 monitoring keep your Z15 Pro units hashing around the clock
• Professional setup and maintenance: Hardware issues are diagnosed and resolved within four hours by on-site technicians
• Nationwide facility network: Operations spanning 27 US states provide geographic diversification and regulatory flexibility
• Scalable hosting tiers: From a single Z15 Pro on the Starter plan to hundred-plus machine Enterprise deployments, Rax Mining scales with your operation

Whether you are purchasing your first Z15 Pro through our Buy & Host program or migrating existing hardware to lower-cost hosting, the combination of best-in-class hardware and low electricity rates gives you the strongest possible position heading into the 2028 halving.

Frequently Asked Questions

When is the next Zcash halving?

The next Zcash halving (the third in the network’s history) will occur at block 4,406,400, estimated to happen in November 2028. As of September 2026, approximately 911,650 blocks remain, which at 75 seconds per block equals roughly 791 days.

What happens to the Zcash block reward after the halving?

The block subsidy will be reduced from 1.5625 ZEC to 0.78125 ZEC per block, a 50 percent reduction. Daily new ZEC issuance will drop from approximately 1,800 ZEC to 900 ZEC, reducing the rate at which new supply enters the market.

Will Zcash mining still be profitable after the halving?

Profitability depends on the ZEC price, your hardware efficiency, and your electricity cost. Miners using the most efficient hardware (like the Antminer Z15 Pro at 3.31 J/KSol) with low electricity rates ($0.055 to $0.085/kWh through professional hosting) are best positioned to remain profitable. Less efficient operations mining at residential electricity rates face significantly higher risk.

How does the Zcash halving compare to the Bitcoin halving?

Both networks use the same fundamental mechanism: a 50 percent reduction in block rewards at fixed intervals, creating a predictable disinflationary supply schedule with a maximum supply cap of 21 million coins. Zcash blocks are produced every 75 seconds (versus Bitcoin’s 10 minutes), so Zcash halvings occur every approximately 1,680,000 blocks in post-Blossom counting, both on roughly four-year cycles.

What is the best ASIC miner for Zcash in 2026?

The Bitmain Antminer Z15 Pro is the most powerful and efficient Equihash ASIC available, delivering 840 KSol/s at 2,780W (3.31 J/KSol efficiency). It is available through Rax Mining’s Buy & Host program for $5,099 including hardware, setup, and hosting onboarding. For current inventory and pricing on all miners, visit our shop.

Should I start mining Zcash before the halving?

Starting before the halving allows you to mine at the current 1.5625 ZEC per block reward level, accumulating more coins while the reward is higher. If the halving triggers a price increase (as halvings have historically done), coins mined today could appreciate in value. The key is ensuring your operational costs are low enough to remain profitable regardless of price movement. Contact Rax Mining to discuss hosting options and profitability projections for your situation.

Disclaimer: This article is for educational purposes only and does not constitute financial advice. Cryptocurrency mining involves risk, and past halving price performance does not guarantee future results. Always conduct your own research before making investment decisions.