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Why the Arabica–Robusta Spread Is Shrinking — and Why It May Not Bounce Back

By: Alexis Rubinstein, Managing Editor - Coffee Network

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CoffeeNetwork (New York) - For years the arabica–robusta price gap quietly did the heavy lifting for the industry, underwriting blend economics and retail price ladders. That “always‑wide” assumption has been fading, and the most revealing part of the story is no longer the narrative—it’s the math.

Start with where we are now. Into late last week, ICE Arabica (May ’26) punched up to roughly 310¢/lb at Friday’s close, a 1½‑month high helped by risk premia around shipping routes and tighter near‑term availability, even as Brazil’s 2026 crop prospects loom large. That level—309.75¢/lb on March 20—is a clean, recent reference for the board’s tone into this week.

On the London side, ICE Robusta (May ’26) settled around $3,669/ton on March 19 after a three‑session climb, leaving the contract in the mid‑$3,500s to mid‑$3,600s band that has characterized much of March trade. Converting that to New York terms puts robusta near 166–167¢/lb (divide $/ton by 2,204.62). [investing.com]

Those two marks give you a contemporaneous arb of roughly 143¢/lb (≈ 310 – 167). It is not the blowout premium that many procurement models grew up with, and it’s remarkably close to where the market was this time last year. [tradingeconomics.com], [investing.com]

To check the year‑ago compare, look at late March 2025. On March 24–25, 2025, Uganda’s coffee authority logged May ’25 ICE Arabica at 393.40¢/lb and May ’25 London Robusta at $5,501/ton. That robusta print translates to roughly 249.5¢/lb, which means the arb then was ~144¢/lb—within a rounding error of today’s reading. In other words, the spread has not re‑expanded despite arabica falling materially from last year’s cyclical highs; robusta has simply held a sturdier floor.

Context explains why. The pressure weighing on arabica is well‑telegraphed: Brazil is on track for a record or near‑record 2026 harvest, with Minas Gerais receiving materially better in‑season rains—enough to rebuild confidence in supply and rebuild certified stocks. That backdrop has capped arabica rallies and encouraged mean reversion whenever weather scares fade.  At the same time, ICE‑monitored arabica inventories rose to multi‑month highs in mid‑March, another depressant on the premium.

Robusta should, in theory, be softer too—Vietnamese flows have improved and the forward balance points to ample canephora across Asia and Brazil. Yet the London board found durable support: exchange stocks have stayed relatively tight, farmers in Vietnam and Indonesia have been measured sellers, and the post‑2023 reformulation of blends has stuck. The upshot is a higher modern floor for robusta. Recent sessions captured that nuance well: even when arabica spiked on shipping risks through the Strait of Hormuz, robusta didn’t crater; it retraced and then recovered alongside tighter ICE robusta inventories.

That is why the spread sits almost exactly where it did a year ago, even though the absolute level of arabica is down sharply year‑on‑year. Arabica peaked near 440–441¢/lb in February 2025; by mid‑March 2026, it was trading around 295–310¢/lb, depending on the day you sample. Robusta, by contrast, has fallen from the $5,500/ton neighborhood last March to the $3,500–3,700/ton area now—but not proportionally enough to hand arabica back its old premium. The blend math of 2026 continues to treat robusta as a strategic input, not a stopgap.

The spread isn’t “snapping back” with lower arabica because robusta is no longer the old robusta. Logistics friction has raised delivered costs from Asian and African load ports; blend reformulations have proven sticky; and buyer behavior at the farmgate remains disciplined. Those real‑economy adjustments have compressed the arb structurally, not just cyclically.

Could the gap widen? Certainly. Brazil’s harvest still has to clear the field, and weather can make a mockery of forward curves in a single week. But it would take a genuine arabica scarcity surprise—or a pronounced robusta liquidation—to re‑inflate the premium to the legacy averages that purchasing teams remember. For now, the math says otherwise.

Alexis Rubinstein

  • Coffee

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