When will the first humans successfully land on Mars?

TL;DR

I forecast a median first successful human Mars landing on 2044-08-09 UTC, with 24% probability by 2040, 56% by 2045, 84% by 2056, and 16% after 2056.

Context

As of 2026-06-02, the public program state is still “Moon first.” NASA’s human-Mars page still lists Mars’s human population as zero and describes astronauts to Mars “as early as the 2030s,” with an example 2039 round trip rather than a committed landing date (NASA Humans to Mars). The live precursor is Artemis: Artemis II launched on 2026-04-01 and returned on 2026-04-10/11, while NASA’s 2026 architecture update moved Artemis III into a 2027 low-Earth-orbit lander/docking test and made Artemis IV the first planned Artemis lunar surface landing in early 2028 (NASA Artemis II blog, NASA Artemis update).

SpaceX is the main upside path, but Starship is not yet a crewed Mars system. SpaceX advertises Starship cargo flights to the Martian surface no earlier than 2028 and gives no firm crewed landing date (SpaceX Mars). Starship Flight 12, the first V3 flight, flew on 2026-05-22, but the FAA required a mishap investigation after the booster’s performance (Space.com Flight 12/FAA report). China is a second path: its official human milestone is a crewed lunar landing by 2030, while its concrete Mars milestone is Tianwen-3 robotic sample return, planned for launch around 2028 and return around 2031 (SCIO/CMSA 2026 update, SCIO/CNSA Tianwen-3 update).

Evidence

The historical base rate is that first-of-kind human spaceflight systems take close to a decade in the fastest modern cases, and much longer when they require multi-element infrastructure. Apollo is the optimistic floor, not the median case for Mars.

The technical gaps are concrete. NASA’s 2024 Mars EDL paper says all flown Mars EDL systems to date landed 0.3–1 metric ton, while human-class Mars EDL requires landed masses over 20 metric tons, more than 20 times larger (NASA Mars EDL challenges). NASA’s Mars ascent-propellant paper says a crew should not arrive on the Martian surface until the means to return are in place, which implies pre-positioned ascent propellant, ISRU, or other return infrastructure even though this question’s resolution does not require return to Earth (NASA Mars ascent propellant). NASA has narrowed one trade by baselining nuclear fission power for initial crewed Mars surface power, but that is an architecture decision, not a fielded system (NASA Mars surface power).

The official signals pull in both directions. The bullish signal is that NASA’s FY2027 budget request includes $8.5 billion for Exploration and $200 million for a near-term human-class Mars lander demonstration, and Administrator Jared Isaacman directed a 60-day study of NTP, NEP, and chemical options to enable unrefueled round-trip crewed and cargo Mars missions by 2036 (NASA FY2027 budget summary, NASA Isaacman workforce message). The bearish signal is that NASA’s Mars architecture page still presents landers, surface systems, ascent systems, and crew systems as an evolving trade space rather than a committed mission line (NASA Mars architecture trade space). NASA’s March 2026 HLS audit also reported schedule risk in SpaceX’s lunar lander work, including cryogenic propellant-transfer and uncrewed demonstration milestones; these are Moon gates, and Mars is harder (NASA OIG HLS audit).

Older independent studies line up with a 2040s center. The National Academies’ 2014 pathway analysis put a budget-driven Moon-to-Mars landing between 2043 and 2050 and warned those dates were likely optimistic because development delays would occur (National Academies Pathways report). IDA’s 2019 STPI review found that even a Mars orbital mission by 2033 was not realistic under the then-current NASA architecture, with a surface mission later than the first orbital mission (IDA STPI Mars 2033 evaluation). ESA’s Explore2040 strategy says the first human Mars landing mission, requiring multiple large landings, will most probably materialize only in the late 2040s (ESA Explore2040).

I modeled the date as a Mars-arrival-window mixture. I used NASA AAS trajectory opportunities as calendar anchors, applied a 75-day normal smoothing kernel to each landing window, and placed direct tail mass before 2030 and after 2056 (NASA/NTRS AAS Mars trajectory paper). The assigned window weights are my forecast, not a market price.

This gives 0.2% before 2030, 5.5% before 2035, 24% before 2040, 56.2% before 2045, 72% before 2050, and 84% before 2056. The median is 2044-08-09 UTC.

What's non-obvious

The resolution criteria do not require return to Earth. That raises the 2030s tail, because a private or national actor could theoretically pre-position supplies, land a crew, and satisfy the question before proving a full round trip. I still keep the early tail small because the first crewed Mars landing will face public, regulatory, insurance, and crew-selection constraints; a “survive touchdown only” mission would count here, but it is unlikely to be the mission any major actor wants to announce.

The other non-obvious point is that Moon-to-Mars is not a single technology ladder. Lunar Starship operations can prove docking, propellant transfer, crew transfer, suits, and surface operations, but they do not prove high-mass Mars EDL through an atmosphere, months-long deep-space crew autonomy, Mars surface fission power, or Mars ascent. That is why a successful Artemis IV in 2028 would move the forecast left, but not all the way into the early 2030s (NASA Artemis update).

Limitations

The largest uncertainty is private information inside SpaceX: reliability targets, refueling hardware, internal Mars EDL design, life-support design, and acceptable crew-risk standards are not public. The second gap is China: current official Chinese sources show a serious lunar program and a serious robotic Mars sample-return program, but I found no current official crewed Mars landing date (SCIO/CMSA 2026 update, SCIO/CNSA Tianwen-3 update). The third gap is politics. NASA budget requests are not multi-decade appropriations, and a future administration, Congress, major accident, or geopolitical shock could move the distribution by one or more Mars windows (NASA FY2027 budget summary).