Months of the Year in Russian

Январь, февраль, март. If those look oddly familiar — January, February, March — that's not a coincidence, and it's not a small one. Russian is a Slavic language. Its close cousins Polish, Ukrainian and Czech all kept beautiful native month names drawn from nature. Russian threw its own away and adopted Rome's. This is the story of the road Russian didn't take.

The 12 months — январь, февраль, март, апрель, май, июнь, июль, август, сентябрь, октябрь, ноябрь, декабрь — are Latin loan words, one for one. They carry the same gods and emperors English does: март is Mars, июль is Julius Caesar, август is the emperor Augustus. A Russian speaker naming the months is, without knowing it, reciting the Roman pantheon.

What Russian gave up

Old East Slavic — the shared ancestor of Russian, Ukrainian and Belarusian — had its own month names, drawn from the year you could see out the window. The exact set varied by region and dialect, and modern reconstructions don't perfectly agree. But the surviving branch is clear enough to see what was lost: the living Ukrainian calendar still uses these names today.

Flip the widget above to "the Slavic road not taken" and you're looking at that lost calendar: березень, the birch month; травень, the grass month; серпень, the sickle month. Russian could have kept all of these. It didn't.

Why Russian switched — and Ukrainian didn't

This wasn't a single overnight switch. The Latin month names had been seeping into Russian for centuries through Byzantine and Church Slavonic channels — they were already the educated norm well before Peter the Great. What Peter's 1700 reform did was change when the Russian year began, moving New Year from 1 September to 1 January and aligning Russia's calendar with western Europe. It didn't invent the Latin month names, but it set the seal on a westward-facing calendar — and in that climate the old Slavic nature-names, already fading, lost any path back into formal use.

Here is the part that makes it land. Ukrainian — Russian's closest linguistic sibling — kept the Slavic names. To this day, a Ukrainian calendar reads січень, лютий, березень — the cold one, the fierce one, the birch month. So this was never about what Slavic languages "can" do. It was a choice. Russia chose Rome; Ukraine kept the birch trees. Two sibling languages, the same starting point, two different calendars hanging on the wall.

Using them: lowercase, masculine, and the case trap

Three rules the vocabulary lists rush past. First: Russian months are never capitalised mid-sentence — январь, not Январь. Capitalising them is one of the most common giveaways of an English speaker writing Russian.

Second: all 12 are masculine. Consistent, at least — no gender to memorise per month.

Third, the real trap: Russian nouns decline, and "in [month]" is not the dictionary form. You use the preposition в plus the prepositional case, which changes the ending. January is январь — but "in January" is в январе. The ending shifts every time:

• в январе
• в феврале
• в марте
• в апреле
• в мае
• в июне
• в июле
• в августе
• в сентябре
• в октябре
• в ноябре
• в декабре

Learn the months only in their dictionary form and you will say every date slightly wrong. Learn the в [month] form alongside it and you sound like someone who has actually used the language.

Sources

• Standard references on Peter the Great's calendar reform of 1700 and the adoption of European month names in Russian
• The native East Slavic month names and their survival in modern Ukrainian — widely documented in Slavic linguistics references
• Russian grammar references for the prepositional case used in "в + [month]" constructions
• Individual Old East Slavic month-name etymologies (e.g. просинец for January) vary between sources [VERIFY — treated as "linked to" rather than asserted, as reconstructions differ]

Related

• Months in Polish — the sibling language that kept every native name
• Numbers 1 to 10 in Russian
• Days of the Week in Russian — where Russian kept the Slavic words
• Months in German — another all-Latin calendar
• Months in Japanese — a calendar reformed away in 1873
• Language & Culture Hub