Key Takeaways:
-
Per our calendar, Aceh Gayo and North Sumatra’s main harvest runs October–March.
-
Aceh Gayo also has a smaller secondary harvest from March to May.
-
Exports usually run February–June, but dates shift yearly, so confirm with suppliers.
-
Sourcing Sumatra alongside Java, Bali, Sulawesi, Flores, and Papua extends year-round supply.
Sumatra is Indonesia’s largest coffee-growing region, so most conversations about Indonesian green coffee begin here. But scale alone doesn’t tell you when the coffee will be ready or how it fits alongside other origins. A harvest calendar does.
Sumatra coffee doesn’t run on a single schedule. Based on our Indonesia Coffee Harvest Calendar, Arabica from Aceh Gayo and North Sumatra has a main harvest from October to March and a typical export window of February to June. Aceh Gayo adds a smaller secondary harvest from March to May.
Dates here are indicative to the two Arabica areas, while Robusta from southern Sumatra follows a different cycle. In addition, Southern Sumatra Robusta harvests March–May in the lowlands and June–August in the highlands.
Why Sumatra Coffee Calendar Matters
While a reputation tells you what an origin is, a calendar tells you when you can buy it. Harvest timing shapes lot availability, drying and processing periods, quality evaluation, export preparation and container planning. Processing sits between harvest and shipment, and with much Sumatra coffee is wet-hulled, so build that time into your plan before harvest starts, not during or after.
According to the 2026 USDA report, Aceh’s usual October–November main harvest was delayed into early 2026 by excessive rain, with some Arabica plantations hit by the late-November 2025 floods may take 2-3 years to recover.
The Sumatra Coffee Calendar
Indonesia Coffee Harvest Calendar. Source: Coffee Beyond Borders
October–March: Main harvest across Aceh Gayo and North Sumatra, lasting roughly six months. Timing shifts with elevation, rainfall and crop conditions. Gayo GI area sits at 900-1,700m, and high altitude plus shades is described as slowing cherry maturity.
March–May: In Aceh Gayo’s secondary harvest, CBB’s calendar puts it at about 30% of the main-harvest volume. This gives you extra supply not long after the main crop, which is useful for continuity or filling smaller specification gaps.
After Harvest: Processing, drying, milling, grading and quality control sit between cherry and container. Allow for these steps when estimating when lots will actually be ready.
February–June: The typical export window. Shipments usually peak during these months, overlapping the end of the main harvest and the secondary harvest. Expect a burst of activity rather than evenly spread shipments, and confirm dates with your exporter each crop year.
How Sumatra Coffee Fits with Other Indonesian Origins
On our calendar, Java, Bali, Sulawesi, Flores and Papua harvest roughly from April to October and ship mainly from July to November, with Sumatra’s cycle runs roughly October to June. The two cycles overlap in May–June and October–November but peak at different times of year.
Combining Sumatra with these origins can give access to green coffee across nearly the full year, and in some months, you can plan several origins together. Which mix suits you depends on what you need:
-
Supply depth and a long purchasing window: Sumatra’s scale and extended calendar are central.
-
A distinct origin story or single-harvest lot: smaller origins such as Bali or Flores may fit better.
-
Coordinated container planning: understanding where cycles overlap and diverge smooth logistics.
Turning the Calendar into a Procurement Plan
|
Period |
Action |
|
Before October |
Agree volumes, specifications and target lots |
|
October–March |
Track the main harvest and early lot development |
|
March—May |
Review Aceh Gayo’s secondary harvest for extra volume |
|
February–June |
Plan exports and containers; note overlap with other origins’ May–June harvests |
|
After June |
Review inventory; plan Java, Bali, Sulawesi, Flores and Papua for July–November |
Early conversations improve visibility into lots and shipments. They don’t guarantee container space or rates.
How Coffee Beyond Borders Helps
CBB links origin selection, harvest timing, processing, quality control with shipment planning across Sumatra and Indonesia’s other producing regions. Its harvest calendar puts the origins side by side, in which buyers can build a Sumatra-anchored, multi-origin plan around volume, quality and timing.
Sumatra coffee’s scale and long calendar make it a natural anchor for Indonesian sourcing. Its overlap with other origins is a planning consideration, not a weakness. Start with the calendar, confirm each crop year with your supplier, and build outward.
Looking to build your Sumatra coffee sourcing plan, or combine it with other Indonesian origins? Connect with the Coffee Beyond Borders team through our Contact Form or WhatsApp to discuss availability, harvest timing, quality specifications, and procurement planning.
References
Coffee Beyond Borders. (2026). Indonesia coffee harvest calendar 2026/2027 [Infographic].
https://www.linkedin.com/posts/indonesia-coffee-harvest-calendar-20262027-ugcPost-7501131177634926593-P3DE/
Masyarakat Perlindungan Kopi Gayo. (n.d.). Kopi Arabika Gayo: Protected geographical indication specification. https://assets.publishing.service.gov.uk/media/665851b97b792ffff71a853c/Kopi_Arabika_Gayo.pdf
Rahmanulloh, A. (2026, May 15). Indonesia: Coffee annual (Report No. ID2026-0021). USDA Foreign Agricultural Service. https://apps.fas.usda.gov/newgainapi/api/Report/DownloadReportByFileName?fileName=Coffee+Annual_Jakarta_Indonesia_ID2026-0021.pdf
Share:
Coffee Processing Beyond Fermentation: How Infrastructure Protects Export-Grade Coffee Quality