Iran's Ballistic Missile Program: What the Latest Tests Reveal

Iran’s recent series of ballistic missile tests, conducted across multiple IRGC launch sites in late spring and early summer of 2025, reveal a program that has moved precision delivery at extended range from aspiration to operational fact. The tests also make clear that Iran is not simply maintaining a deterrent. It is actively investing in capabilities designed to defeat the missile defense systems deployed by its principal adversaries.

TL;DR

• The Fattah-2 hypersonic glide vehicle defeats Arrow-3 and THAAD by maneuvering laterally during its terminal phase, after the point where conventional interceptors can reposition.
• Khorramshahr-4 reportedly achieves a CEP under 30 meters at 2,000 kilometers. At that accuracy, it can threaten hardened installations the Shahab-3 could only gesture at.
• Iran has converted its missile force from liquid-fuel to solid-fuel propulsion, cutting launch preparation from hours to minutes.
• The Sejjil-2 two-stage solid-fuel missile, range exceeding 2,000 kilometers, is in operational service with the IRGC Aerospace Force.
• Iran is expanding production at Khojir and Parchin. Satellite imagery shows new manufacturing halls constructed after the October 2024 salvo, which suggests replacement was not the goal.
• In October 2024, Iran launched over 180 ballistic missiles directly at Israel.
• Iran refuses to include its missile program in nuclear negotiations.
• The tests were conducted during a period of relative operational calm, not in response to a crisis. That choice is deliberate.

What did Iran’s spring 2025 missile tests actually show?

The most significant test involved what Iranian state media identified as the Fattah-2 hypersonic glide vehicle, a maneuvering reentry vehicle capable of defeating conventional ballistic missile defense. Unlike a traditional ballistic missile that follows a predictable arc, the Fattah-2’s terminal phase involves lateral maneuvering, making intercept calculations exponentially more difficult for systems like Israel’s Arrow-3 or the U.S. THAAD batteries deployed across Gulf states. The physics of missile defense require interceptors to be positioned before the incoming round reaches the terminal phase. A weapon that changes trajectory in that phase negates much of the positional advantage that layered defense depends on.

Separately, the IRGC Aerospace Force conducted a test of the Khorramshahr-4, a medium-range ballistic missile with a reported CEP (circular error probable, the standard measure of accuracy) of under 30 meters at 2,000 kilometers. That figure, if independently confirmed, is worth sitting with. Iran’s earlier Shahab-3 variants were considered area-effect weapons, useful for broad intimidation rather than precise targeting. A missile that can reliably place a warhead within 30 meters of a target at 2,000 kilometers opens up a different target set entirely: hardened military installations, command-and-control nodes, airfield infrastructure, and naval vessels that the earlier generation could not credibly threaten. The difference is not incremental. It changes what the weapon is for.

Why does the shift to solid-fuel propulsion matter?

The structural change in Iran’s missile program is as consequential as the technical one. Iran has been systematically converting its missile arsenal from liquid-fuel to solid-fuel propulsion, and the implications run through the entire deterrence equation.

Liquid-fuel missiles require hours of preparation before launch: fuel loading, pressurization, systems checks. That preparation window leaves them vulnerable to preemptive strikes if the process is detected by satellite or signals intelligence. An adversary with good real-time imagery and a willingness to act first could theoretically destroy liquid-fuel missiles before they were ready. Solid-fuel missiles close that window. They can be deployed and fired within minutes of an order, compressing the decision timeline for any adversary considering a preventive strike in ways that liquid-fuel missiles never did.

The Sejjil-2, a two-stage solid-fuel missile with a range exceeding 2,000 kilometers, appears to have entered operational service with the IRGC Aerospace Force. Its existence means Iran now maintains something closer to a survivable second-strike capability. The missiles can be dispersed across mobile launchers, concealed in tunnels or hardened shelters, and launched before an adversary could credibly suppress them. It is the same strategic logic that led nuclear powers to develop submarine-launched ballistic missiles: a force the adversary cannot confidently destroy in a first strike provides genuine deterrence, because retaliation after any attack becomes certain. That logic does not require a nuclear warhead to operate. Iran is applying it to a conventional arsenal.

The solid-fuel shift also changes the geography of missile warfare. Mobile solid-fuel launcher can be positioned and repositioned across Iran’s mountainous interior, making fixed-site targeting (the approach that worked against Iraq’s Scud infrastructure in 1991) far less effective. Israel and the United States have spent considerable intelligence resources tracking Iran’s deployment patterns precisely because the mobility of the force makes it difficult to fully map and even more difficult to neutralize quickly. The calculus that might have supported a decisive first strike against a static, liquid-fuel force does not transfer cleanly to a dispersed, mobile, solid-fuel one.

Is Iran building missiles faster than it’s using them?

The tests also coincided with what U.S. and Israeli intelligence assessments describe as a significant expansion of Iran’s missile production infrastructure. The expansion is visible from orbit: satellite imagery reviewed by nonproliferation research organizations shows new manufacturing halls at the Khojir complex east of Tehran, along with substantial expansion at the Parchin Military Complex southwest of the capital.

Iran is not merely testing for signal. It is building inventory. Before the October 2024 salvo against Israel, current estimates put Iran’s ballistic missile stockpile at roughly 3,000 missiles. The October strikes consumed approximately 180 of those. Production data since then suggests the program has been generating missiles at a pace that exceeds simple replenishment. The expansion at Khojir points toward an ambition that runs past restoring the pre-strike baseline.

This matters for the attrition calculus any adversary runs when contemplating a strike on Iran’s missile force. Destroying 3,000 missiles is a different proposition than destroying 5,000, and the possibility that Iran is targeting larger numbers in the future affects how planners in Tel Aviv and Washington assess the costs and timing of military options. A force that can quickly reconstitute losses after a strike requires a different approach than one that cannot. The window for a strike that meaningfully degrades the force narrows if production continues at this pace.

The industrial capacity also carries export implications. Iran has supplied ballistic missiles and components to Russia for use in Ukraine, to the Houthis in Yemen, and to various Iraqi militia groups. An expanded manufacturing base enables expanded supply to proxy networks, extending the strategic reach of the program well beyond Iranian territory. The missile production line is, in this sense, also a foreign policy instrument.

What is Iran signaling, and to whom?

The calculus here is worth pausing on, because the tests do not carry a single message.

The Fattah-2’s terminal maneuverability is specifically designed to stress Israel’s Arrow-3, the uppermost tier of its layered missile defense. The signal is not that missile defense is useless but that it has a ceiling, and Iran is investing to find where that ceiling is. No location in Israel is beyond the range of Iran’s current arsenal. What these tests raise is whether any location is reliably protected against a sophisticated salvo, particularly one that mixes maneuvering vehicles with conventional ballistic trajectories to tax the defense across multiple intercept layers simultaneously.

For Washington, the tests reinforce what serious regional planners already account for: U.S. bases in Qatar, Bahrain, Kuwait, Iraq, and elsewhere are within range of Iran’s most capable missiles. A military confrontation would expose those facilities to strikes capable of inflicting significant casualties and degrading operational capacity in ways the Gulf Wars did not. The precision now demonstrated makes the threat to fixed military infrastructure more concrete than it was a decade ago.

What tends to get less attention than it deserves is the message directed at Hezbollah and the Houthis. Hezbollah’s missile program was largely destroyed in the 2024 war with Israel. The Houthis absorbed significant attrition from U.S. and Israeli strikes throughout the same period. Iran’s visible investment in its own capabilities during this stretch of relative quiet signals that the resources and the will exist to reconstitute proxy missile forces when conditions allow. It is a statement about commitment as much as capability, and that distinction matters for how those organizations read their long-term relationship with Tehran.

The timing underscores all of this. These tests were conducted during a period of operational quiet following the ceasefires in Lebanon and Gaza, not during active hostilities. Iran did not wait for the next crisis to demonstrate what it could do. That choice is deliberate, and it carries its own message: the capability exists independent of any particular conflict, and Iran intends to make sure that is understood.

Frequently Asked Questions

How far can Iran’s ballistic missiles reach?

The Khorramshahr-4 and comparable systems have a stated range of around 2,000 kilometers, placing Israel, U.S. Gulf bases, and parts of Eastern Europe within reach. Some variants, with reduced payloads, may extend beyond 3,000 kilometers. The honest answer is that independent verification of Iran’s claimed ranges is difficult, and Tehran has an incentive to overstate. What’s documented is already sufficient to cover most of the targets Iran cares about.

Has Iran used its ballistic missiles in combat?

Yes. Over 180 missiles were fired at Israel in October 2024, the second direct state-on-state ballistic missile attack in the region’s modern history. Iran also struck U.S. bases in Iraq in January 2020 following the killing of Qasem Soleimani. Both episodes moved the program from deterrence-in-theory to demonstrated operational use.

What does Iran’s missile program mean for a future nuclear deal?

Missiles have been the hardest issue in every round of nuclear talks, and the 2025 tests don’t make that easier. Iran’s position is that its missile force is a conventional deterrent, not a nuclear delivery system subject to negotiation, and it will not trade the program away while the United States maintains bases and security guarantees across the region. Western negotiators want limits; Iran won’t give them. The technical advances shown in the spring tests make any verification regime harder to design, even if the political gap were bridgeable, which at the moment it isn’t. Neither side has shown any movement on this specific point.

What is the Fattah-2 hypersonic missile?

It’s a maneuvering reentry vehicle that adjusts trajectory during the terminal phase of flight, after the point where most missile defense systems have already committed their interceptors. That makes it harder to engage than a conventional ballistic missile, which follows a predictable arc. Whether the Fattah-2 performs in actual combat conditions the way it performs in controlled tests is a separate question, and one that hasn’t been answered yet.