When to visit Estonia: month-by-month

January and February: frozen, cheap and underrated

Deep winter means daytime highs of -2 to -6°C, sometimes -15°C or colder inland, and daylight from roughly 09:00 to 16:00 lengthening quickly through February. Snow cover is reliable in the southeast and around Otepää and patchier on the coast. This is spa season: Kuressaare and Haapsalu doubles fall to €80 to €125 with pool, sauna and often dinner included, and Pärnu sits at €85 to €130. Tallinn's Old Town under snow, with the medieval walls and the Christmas market residue, is genuinely beautiful and empty of cruise crowds.

February is the better of the two: more light, deeper snow, and hard frost that opens the country's rarest experience — walking on frozen bog off the boardwalk, and in a proper freeze, the ice roads to the small islands. Otepää has cross-country tracks around Tehvandi and Kääriku plus a modest downhill hill, with hotels at €100 to €150. The catch is the school-holiday week when spa hotels fill and rates jump. Pack for -15°C and check daily whether ice roads are officially open before driving on sea ice.

March and April: the fifth season

March is a transition month, often the sunniest of the winter half with snow still on the ground, and it hosts Estonia's strangest natural event. In late March or April, snowmelt floods the Halliste and Raudna rivers in Soomaa National Park until forest, meadow and road are one sheet of water — the "fifth season". Guided canoe trips through flooded forest cost roughly €40 to €70 per person, and local guides still build the haabjas, the single-log dugout whose craft is on the UNESCO heritage list. It is the most memorable thing you can do here.

April is muddy, brown, and one of the two best birding months in Europe's flyway. Matsalu National Park's towers at Keemu and Haeska hold tens of thousands of staging geese, swans and cranes; the Kabli station south of Pärnu is similar. Prices are at their lowest, roads are clear, and nothing is crowded. Downsides are real: trails are waterlogged, many rural cafés and museums have not opened for the season, and the landscape only turns green in the last week of April. Bring waterproof boots and low expectations of colour.

May: the best-value month of the year

May is my pick for anyone who is not travelling with school-age children. The forest floor turns green in the first fortnight, wild garlic and anemones appear, birdsong peaks, mosquitoes have not started, and daylight stretches to 17 hours by the end of the month. Daytime temperatures run 12 to 18°C, occasionally 22°C. Accommodation sits at shoulder rates: Pärnu spa doubles at €90 to €120, Lahemaa manors at €110 to €150, Tallinn hotels 20 to 30 percent below July. Bog boardwalks and cycling routes are at their absolute best.

The one thing May does not deliver is swimming — the sea is 8 to 13°C and only the committed go in. Plan around that and you get everything else: the Käsmu peninsula in fresh leaf, Saaremaa's juniper heaths before the season crowd, Tartu's student city in full term, and empty bogs. Late May is also when rural accommodation and museums come back on stream, so the country works logistically. If I had one week in Estonia and free choice of dates, it would be the last week of May.

June: light, jaanipäev and the mosquitoes

June brings the light that defines the Estonian year — around 19 hours of daylight at solstice and a dusk that never quite darkens, so you can walk a bog at 22:30 in full visibility. Temperatures reach 17 to 22°C, occasionally 27°C, and the sea climbs to 15 to 18°C by month's end, swimmable if you are brave. Jaanipäev, midsummer on 23 and 24 June, is the biggest holiday of the year: bonfires, swings, smoked meat and beer in villages everywhere, and a country that closes almost entirely for two days.

Book jaanipäev accommodation months ahead and expect rural shops and museums to be shut on 24 June. The other June reality is insects: mosquitoes and horseflies in Soomaa, the Lahemaa peninsulas and any bog forest from mid-June are severe enough to end an evening walk. Repellent, long sleeves and a head net for bog trips are not optional. Prices sit just below July peak until midsummer, then jump. Early June — the first two weeks — is the year's best combination of light, price and comfort.

July and August: the swimming weeks

These are the only months when Estonia is a beach destination. Pärnu Bay and the shallow western bays reach 20 to 23°C, air temperatures run 20 to 26°C with occasional 30°C spells, and the whole national mood shifts to the coast. Pärnu triples in population, Saaremaa's cottage rates rise 30 percent, and Tallinn's Old Town fills with cruise passengers between 10:00 and 16:00. Expect spa doubles at €140 to €220 in Pärnu, €110 to €160 in Kuressaare, and Tallinn hotels at their annual peak.

The compensations are the festivals: the Viljandi Folk Music Festival in late July, which is the best cultural event in the country and needs tickets and beds booked months early; the Pärnu Music Festival across July and August; village festivals and maritime days on Saaremaa; and the Song and Dance Celebration in Tallinn when its multi-year cycle comes round. August brings warmer water, cooler nights, thunderstorms and berry season. Rain is frequent in both months — around 12 to 14 wet days each — so keep a spa or museum plan in reserve.

September and October: the connoisseur's window

September is the second-best month after May, and for bogs and forests it is the best full stop. Bog cranberries ripen, peatlands turn russet and gold, mosquitoes vanish, the sea holds 16 to 19°C into the first fortnight, and autumn migration puts huge numbers of cranes and geese through Matsalu and the Peipus shore. Air temperatures are 12 to 18°C. Prices drop to shoulder rates within the first week: Pärnu at €95 to €130, Lahemaa manors at €120 to €170, and islands noticeably quieter and negotiable.

October is beautiful and closing down. Colour peaks in the first half, mushroom picking is at its national obsession level, and daylight falls from 11 hours to 9. Rural cafés, boat trips and small museums begin shutting from mid-month, and by the end you need a plan built around towns and spas. Storms on the west coast and islands can delay ferries. If you like empty landscapes, dark evenings, sauna and few other visitors, mid-October on Hiiumaa or in Lahemaa is a specific and rewarding pleasure.

November and December, and how to choose

November is the month to skip. Daylight shrinks to 7 hours, average highs sit at 1 to 4°C, and it rains or sleets on more than half the days without snow to redeem it. Prices are at rock bottom — Kuressaare spa doubles at €80 — and if a cheap indoor wellness week is all you want, that is a fair trade. Otherwise the landscape is grey and much of rural Estonia is shut. December improves with the first snow and with Tallinn's Christmas market on Town Hall Square, one of the prettiest in Europe.

So: last week of May or first fortnight of June for light, prices and walking; September for bogs, colour and swimmable-just sea; July only if you need the water and can accept the crowds and rates; February for snow, spas and frozen bog; late March or April for Soomaa's flood and the bird migration. Whatever the month, pack layers and a genuinely waterproof jacket — the Baltic coast's wind means 12°C feels like 6°C, and the country's rainfall is spread thinly across the whole year rather than concentrated in a season.