0DTE Diagonal Spread Options Trading Strategy | 0DTE Guide

By James Collins, CMT

Reviewed by Sarah Jenkins, CFA

Last reviewed: 2026-09-24 Editorial Policy

The Foundation

The Diagonal Spread

Express directional views while exploiting multi-timeframe theta decay.

Overnight Risk

100%

Intraday Focus

SPX Daily Chart

Live Institutional Flow

Whether you’re new to zero-days-to-expiration or scaling an existing approach, understanding the fundamentals of 0DTE trading strategy is essential before you trade live capital. This guide covers.

The Nuance of a 0DTE Diagonal Spread

The 0DTE Diagonal Spread is widely considered an advanced, complex options strategy because it forces you to manage multiple changing variables simultaneously. It is called a “diagonal” because it combines elements of a vertical spread (different strike prices) with a calendar spread (different expiration dates).

In the context of 0DTE trading, a diagonal spread typically involves selling an option that expires at the end of the current trading day, while simultaneously buying an option that expires in the future (e.g., tomorrow, next week, or next month) at a different strike price.

The Structural Setup

To initiate a standard 0DTE Diagonal Spread (often a “Poor Man’s Covered Call” variant), you execute the following:

The Long Leg: Buy 1 In-The-Money (ITM) Option (Call or Put) expiring at a later date. This acts as your directional anchor.
The Short Leg: Sell 1 Out-Of-The-Money (OTM) Option (Call or Put) expiring today (0DTE). This generates immediate income to offset the cost of the long leg.

Because you are buying an ITM option with significant time value, and selling an OTM option with very little time value, entering a diagonal spread will almost always cost you a net debit upfront.

How the Diagonal Makes Money

Profitability in a diagonal spread is driven by a delicate balance of Delta (directional movement) and Theta (time decay).

The primary engine of the trade is the 0DTE short leg. Because it expires today, its Theta decay is incredibly aggressive. If the market stays relatively flat or moves slowly in your favored direction, the short option decays to zero by the end of the day, allowing you to pocket the premium.

Meanwhile, your long, later-dated ITM option retains its value much better because its Theta decay curve is much flatter. By repeatedly selling 0DTE options against your long-dated position over several days, you can completely pay off the cost of the long option, eventually turning it into a “free” trade.

When to Deploy the Diagonal Spread

Mild Directional Bias:

The absolute best time to deploy a diagonal spread is when you have a slow, grinding directional bias. You want the stock to drift slowly toward your short strike without blowing past it today.

High Near-Term Volatility:

If 0DTE options are pricing in massive implied volatility (IV) due to an impending intraday event, but back-month IV is low, a diagonal allows you to sell the expensive front-month premium while buying cheap back-month exposure.

Capital Efficiency:

Buying 100 shares of SPY to sell covered calls costs roughly $50,000. Buying a deep ITM long-dated SPY call (Delta 0.80+) to use as the base for a diagonal spread might only cost $2,000, while providing nearly identical directional exposure.

Essential Risk Management for Diagonals

Trading diagonal spreads successfully requires strict adherence to risk parameters, as the dynamic Greeks can quickly spiral out of control:

Beware the Blow-Off Top:

The biggest risk to a diagonal spread is a massive, instantaneous move past your short strike. If SPY rockets upward past your short 0DTE call, your short call will start accumulating losses at a 1:1 ratio (Delta -1.0), while your long call might only gain at a 0.8 ratio (Delta 0.8). You can lose money if the stock goes too far in your favored direction.

Diagonal Widths:

Ensure the width between your long and short strikes is wide enough. If you buy a $400 Call and sell a $401 Call, you have almost no room for the stock to move.

Profit Taking:

The goal is to collect the theta decay of the short leg. If your short 0DTE option decays by 80% by 1:00 PM, close the entire spread or buy back the short leg. Do not hold it for the last $0.05 of premium and risk a late-day reversal.

Managing the Long Leg:

At the end of the day, after the 0DTE option expires worthless, you are left holding a naked long option. You must decide whether to hold it overnight, sell it for a profit, or use it tomorrow to sell another 0DTE option against it.

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To further refine your strategy, consider comparing this approach with the 0DTE Iron Butterfly Strategy: The Ultimate Guide or exploring the mechanics behind 0DTE Cash-Secured Put. Everything ties back into the foundational concepts available in our 0DTE Strategies Hub.

If you want to visualize these market forces live, check out the 01DTE dashboard.

Frequently Asked Questions

What is 0DTE Diagonal Spread in the context of 0DTE trading?

Yes, understanding 0DTE Diagonal Spread is critical for day traders. It refers to the specific methodology of managing zero days to expiration positions by leveraging intraday volatility. Traders use this approach to capture rapid premium decay while strictly defining their risk parameters. By utilizing this strategy correctly, you can optimize your entry and exit points throughout the trading session without holding overnight risk.

How does 0DTE Diagonal Spread impact risk management?

The primary risk when using 0DTE Diagonal Spread involves sudden intraday market reversals (gamma risk). Because 0DTE options expire the same day, any adverse movement in the underlying asset can result in rapid, exponential losses if left unmanaged. Strict stop losses, position sizing limits (risking no more than 1% to 2% of account capital), and automated risk controls are absolutely essential to survive over the long term.

Is 0DTE Diagonal Spread suitable for beginner traders?

No, beginners should exercise extreme caution. 0DTE Diagonal Spread requires a deep understanding of options pricing models, Greek dynamics (especially Gamma and Theta), and order execution speed. Novice traders should spend several months paper trading and backtesting their approach before risking live capital, as the emotional and financial swings associated with this strategy can be overwhelming without prior experience.

What is the best time of day to execute 0DTE Diagonal Spread?

Execution timing depends heavily on the specific setup, but many professional traders prefer to enter 0DTE Diagonal Spread trades during the mid-morning session (around 10:30 AM to 11:30 AM EST) after the initial opening volatility has subsided. Others wait for the final two hours of the day (2:00 PM to 4:00 PM EST) to capture the most aggressive phase of theta decay, though this carries elevated directional risk.

Which brokers are best for trading 0DTE Diagonal Spread?

For executing 0DTE Diagonal Spread, you need a broker with direct market access, lightning-fast execution, and favorable commission structures. Interactive Brokers, Tastytrade, and ThinkOrSwim (Charles Schwab) are highly recommended by professionals. These platforms offer robust API integrations, advanced charting tools, and the necessary options permissions (Level 2 or higher) required to trade complex intraday strategies effectively.