Top Accelerator Deadlines for Founders: August to October 2026
Application windows close faster than most founders expect. Below is a ranked breakdown of every open program this week, sorted by stage and deadline so you can prioritise your time and effort.
Pre-seed
These programs target founders who are still forming their team, validating an idea, or have not yet shipped a product.
- On Deck (apply by Aug 30, 2026): Built for founders who are pre-product and working through idea validation. Cohort-based with strong peer networks. Apply here
- Antler (apply by Sep 30, 2026): Designed for solo founders or pre-team operators who want co-founder matching alongside a first institutional cheque. Residency format means you spend dedicated time building in community. Apply here
- Entrepreneur First (apply by Oct 15, 2026): A talent-first model focused on co-founder matching before a company formally exists. Best suited for technical or domain-expert founders who want a structured process for finding the right partner. Apply here
Seed
These programs work best with founders who have a product, some early traction, and are raising or have raised a seed round.
- Techstars (apply by Aug 15, 2026): Runs more than 40 vertical-specific accelerators globally, making it one of the broadest programs for seed-stage companies across industries from healthcare to fintech to climate. Deadline is the soonest of any program this week. Apply here
- 500 Global Founders Fund Track (apply by Sep 1, 2026): Targets late-seed to early growth companies ready to accelerate revenue and distribution. The program leans toward founders with a working product and measurable momentum. Apply here
Series A and All Stages
This category includes programs that welcome a wide range of stages, from first-time founders to companies approaching a Series A raise.
- Y Combinator Winter 2027 (apply by Sep 25, 2026): Open to all sectors, with particular appetite for AI, hard tech, fintech, and climate. YC accepts companies from idea stage through early revenue, making it genuinely stage-agnostic in practice. The brand recognition and alumni network remain unmatched. Apply here
How to Prioritise
If you are pre-product or still looking for a co-founder, focus on On Deck, Antler, and Entrepreneur First in that order based on your timeline. If you have a working product and early revenue, Techstars is the most urgent deadline this week, followed by 500 Global and then YC, which offers the longest runway before its close date but rewards early, polished applications.