Will the ceasefire between Iran and the United States continue to hold 7 days from today?

TL;DR

I estimate a 67.3% chance that the U.S.-Iran ceasefire is still treated as holding on June 11, 2026, because official and major-wire language still frames the current fighting as severe violations inside a fragile ceasefire rather than a declared return to large-scale war (AP, June 4, Reuters, June 4, CENTCOM/DVIDS, June 2).

Context

The forecast date is June 4, 2026, so the resolution date is June 11, 2026. The ceasefire began as a two-week pause announced on April 7, with Iran accepting safe passage through the Strait of Hormuz and a U.S. defense official saying the ceasefire was in effect (Axios, April 7). On June 4, AP described the conflict as having settled into a holding pattern, with a tentative 60-day ceasefire extension still needing President Trump’s signoff, and said this week’s U.S.-Iran strikes raised concern the ceasefire could collapse, not that it had already collapsed (AP, June 4).

The situation is close to the boundary. On June 2, CENTCOM said Iranian missiles and drones were defeated and U.S. forces struck Qeshm Island, while also saying no U.S. personnel were harmed and forces remained ready during the ongoing ceasefire (CENTCOM/DVIDS, June 2). On June 3, AP reported Iranian drones heavily damaged Kuwait International Airport, killing one person and wounding dozens, but still called it the latest back-and-forth attack testing a fragile ceasefire (AP, June 3).

Evidence

The historical base rate says short-run ceasefire survival is usually high, but weak ceasefires fail often enough to matter. The ETH/PRIO Civil Conflict CeaseFire dataset covers 2,202 ceasefires in 66 countries and 109 civil conflicts from 1989 to 2020; it is a civil-conflict dataset, so I treat it as a weak prior for this interstate case (Journal of Conflict Resolution, 2023). In that dataset, failed ceasefires have median durations of about 10 days at a one-fatality threshold, 65 days at a 25-fatality threshold, and 193 days at a 100-fatality threshold, which fits the key point that many ceasefires survive violations but not renewed large-scale violence (Journal of Conflict Resolution, 2023). A separate study of written civil-war ceasefires from 1990 to 2019 found that, at a 25-battle-death threshold, 30-day survival was about 85% for simple cessation-of-hostilities agreements, 92% for preliminary agreements, and 96% for definitive ceasefires; by three months, those rates fell to 48%, 70%, and 80% (International Studies Quarterly, 2021).

This U.S.-Iran ceasefire is about day 58 if counted from April 7, but it looks more like a weak cessation-of-hostilities arrangement than a definitive peace. I found no public signed text with a neutral monitoring mechanism, and the tentative 60-day memorandum remained unsigned as of AP’s June 4 reporting (AP, June 4). That pushes the base-rate prior down. But the question’s resolution standard pushes it back up: the ceasefire need not be clean; it only has to avoid a widely acknowledged return to sustained or large-scale U.S.-Iran hostilities.

The strongest case for YES is revealed tolerance. On May 7, Reuters reported that the United States and Iran exchanged fire in the most serious test of their month-old ceasefire, but Trump said the ceasefire was still in effect and the U.S. said it did not want escalation (Reuters via Internazionale, May 8). On May 28, AP reported a tentative U.S.-Iran agreement to extend the ceasefire by 60 days, while also noting the ceasefire was wavering and that Washington and Tehran had traded strikes and accusations without returning to full-scale hostilities (AP, May 28). On June 1, AP described U.S. strikes and Iranian missiles at U.S. troops in Kuwait as repeated tests of a nominal ceasefire, not as the ceasefire’s end (AP, June 1).

The strongest case for NO is that the last few days are worse than the base rate. Reuters reported on June 4 that Iranian and U.S. forces had traded attacks in the Gulf in one of the most intense bouts of fighting since early April, when a ceasefire halted large-scale hostilities (Reuters, June 4). The same Reuters report said Hezbollah rejected the Lebanon ceasefire, Israel would not withdraw or halt operations, and Iran had made a Lebanon ceasefire a condition for peace with Washington (Reuters, June 4). That matters because Lebanon is a trigger for escalation, but it only resolves this question NO if it becomes direct U.S.-Iran hostilities.

Maritime data show why the ceasefire remains unstable. IMF PortWatch daily Strait of Hormuz chokepoint data are vessel transits and cargo capacity; the full available Hormuz record I used covers September 5, 2023 through May 31, 2026, with 1,000 daily observations, and the latest observation available was May 31, 2026 (IMF PortWatch). The full annual history in that record is:

May gives the cleanest same-month comparison. The available May history in the returned data has 93 daily observations: May 2024 averaged 105.5 vessels per day, May 2025 averaged 106.5, and May 2026 averaged 4.7 (IMF PortWatch). That is not normalization. It means Hormuz remains a live military and economic pressure point. It also means both sides have reason to keep the ceasefire label alive while they bargain over reopening the strait.

Domestic U.S. incentives lean against an acknowledged resumption of large-scale war. AP reported that the House approved a war-powers resolution on June 3 by 215-208 to halt U.S. military action against Iran, with four Republicans joining Democrats, though next steps are uncertain and Trump would likely resist a binding constraint (AP, June 3). AP also reported on June 4 that some Republican lawmakers, Pentagon officials, and Gulf allies were advising against returning to a bombing campaign, partly because the U.S. had burned through munitions quickly and some systems could take three years to replenish (AP, June 4).

My calculation is a scenario model. I first assign a 95.5% chance that resolvers treat a ceasefire as still in effect on June 4, because AP, Reuters, and CENTCOM continue to use ceasefire language after the June 1-3 exchanges (AP, June 4, Reuters, June 4, CENTCOM/DVIDS, June 2). Conditional on that, I use four paths for June 4-11:

The conditional YES rate is 70.46%. Multiplying by the 95.5% current-status assumption gives P(YES) = 0.955 x 0.7046 = 0.672893.

What's non-obvious

The easy read is that missiles and airstrikes mean the ceasefire is already over. The reporting threshold is different. Reuters described May 7 exchanges as the most serious test yet while Trump said the ceasefire was still in effect, AP described June 1 exchanges as repeated tests of a nominal ceasefire, and CENTCOM described June 2 U.S. strikes on Qeshm Island as occurring during the ongoing ceasefire (Reuters via Internazionale, May 8, AP, June 1, CENTCOM/DVIDS, June 2). Under this question’s rules, that language matters more than a literal zero-fire standard.

The second non-obvious point is that the same facts create both danger and restraint. Hormuz traffic is near crisis lows, Lebanon is not contained, and direct U.S.-Iran exchanges are getting harder to narrate away (IMF PortWatch, Reuters, June 4). But those pressures also make an explicit return to full war costly for Washington, Tehran, Gulf states, and oil consumers, which is why the modal path is not peace; it is a dirty ceasefire that survives another week.

Limitations

The biggest uncertainty is the resolution threshold. If resolvers treat the June 1-3 pattern as sustained exchanges of fire rather than isolated or contained violations, the correct probability would be much lower; I put that current-status ambiguity at 4.5% because major sources still describe the ceasefire as nominal, fragile, or at risk rather than over (AP, June 3, AP, June 4).

The second gap is the lack of a public signed ceasefire text or monitoring mechanism. That makes it hard to know what the parties themselves regard as a violation versus a collapse. The third gap is warning time: one successful Iranian strike killing U.S. personnel, one major U.S. naval loss, or a large U.S. bombing package could change the media consensus within hours. That fat-tail risk is why I stop in the high 60s rather than moving toward the generic one-week survival rate for older ceasefires.