The trade balance was positive at $10.956 billion in the month, exceeding the median forecast of a $9.05 billion surplus, according to a Reuters poll of economists.
It was the highest surplus for the period since the series began in 1989, according to the Ministry of Development, Industry, Trade and Services.
Exports reached $33.060 billion, up 7.5% from March last year, boosted by a 53.8% jump in crude oil exports and 8.9% growth in soybean exports.
In February, crude oil exports suffered a sharp decline, and the ministry had anticipated a rebound in March amid high volatility in oil exports.
Total imports in March fell 3.1% from a year earlier to $22.104 billion.
The ministry forecast that the country's trade surplus will reach $84 billion this year, up from $62 billion in 2022.
(Reporting by Marcela Ayres, editing by Deepa Babington)
