How long does accession take?
How long each past EU accession took, and how our model scores against the ones that have finished. Every estimate is measured against this record.
When each candidate is projected to join
The most-likely year (dot) within the P10–P90 range (bar), soonest first. Open-ended bars (▸) mean a frozen process with no modelled end.
- Montenegro~2031
- Albania~2032
- Moldova~2033
- Ukraine~2033
- Serbia~2036
- North Macedonia~2037
- Bosnia and Herzegovina~2038
Estimates, not facts — the bar is the modelled range, not a guarantee.
Still waiting — years so far
How long today's candidates have waited since they applied. Several have already passed the time any completed accession took (▸ = still counting).
Accessions that completed
How long each took, from the start to membership — open any country for its phase-by-phase breakdown (✓).
Czech Republic8.3 years
- Application → membership (1996 → 2004)8.3 years
Applied in 1996, two years later than Poland and Hungary, but joined in the same 2004 wave.
- Negotiations (1998 → 2002)4.7 years
Negotiated with the Luxembourg group from 1998.
Slovakia8.9 years
- Application → membership (1995 → 2004)8.9 years
Started negotiations later, in the 2000 'Helsinki group', and still caught the 2004 wave.
- Negotiations (2000 → 2002)2.8 years
Only about 2.8 years of negotiations, the fastest of this group.
Croatia9.0 years
- Negotiations (opened Oct 2005 → closed Jun 2011)5.7 years
Croatia negotiated all 35 chapters over roughly 5.7 years, a common yardstick for a candidate without a war.
- Treaty signed (Dec 2011) → membership (Jul 2013)1.6 years
Ratification by 27 member states + Croatia took about 19 months after signature.
- Candidate status (2004) → membership (2013)9.0 years
About nine years from candidate to member, the most recent full accession.
Poland10.1 years
- Application → membership (1994 → 2004)10.1 years
The largest 2004 entrant. Applied in 1994 and joined a decade later.
- Negotiations (1998 → 2002)4.7 years
Negotiated in the 1998 'Luxembourg group' over roughly 4.7 years.
Hungary10.1 years
- Application → membership (1994 → 2004)10.1 years
Applied in 1994; part of the first 1998 negotiating group.
- Negotiations (1998 → 2002)4.7 years
About 4.7 years of negotiations alongside the Luxembourg group.
Backtest: does the model track completed accessions?
Run for a generic peacetime candidate just opening negotiations, the structural model predicts membership in 3.8–13.9 years (most likely 7.6). The accessions that have actually completed:
- Croatia7.7 yearsAl Jazeera
- Poland (2004 wave)6.1 yearsPublications Office of the EU (EUR-Lex)
- Bulgaria & Romania6.9 yearsPublications Office of the EU (EUR-Lex)
3 of 3 fell within the predicted range.
These predate the 2020 cluster methodology, so the mapping is approximate — an honest sanity check, not a precision claim.
Not every path ends in membership
These forecasts estimate a process that can stall, reverse, or be turned down. It isn't a countdown to a sure thing. A few countries that started toward membership and turned back:
- Norway negotiated entry, then its voters rejected membership in referendums twice, in 1972 and 1994. It joined the single market through the EEA instead. Source ↗
- Iceland applied after its 2008 banking crisis, suspended talks in 2013, and withdrew its application in 2015. Source ↗
- The United Kingdom joined in 1973 and left in 2020, the first member state ever to leave. Source ↗