🎟️ What is open at Birr castle: tickets, opening hours and a 120-acre park

Birr Castle looks like a set from a historical film, but it remains a lived-in home. The estate in County Offaly has belonged to the Parsons family for four centuries. You won't get inside the mansion: it is the private residence of the current earl. But the park, the science center, and the Leviathan telescope are open to visitors almost year-round. Below is the practical side: what to see, how much tickets cost, and how to get there from Dublin without a car.

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Castle history

💡 In short:

Entry to the castle interior is not included in the ticket: it is the Parsons family's private home.
The general ticket covers the park, the science center, and the Leviathan telescope.
An adult ticket starts at 14 €, a family ticket for four is 35 € (as of 09/2026, tickets and rates).
Prices and opening hours: 09/2026, checked on the official website.

A stone fortress appeared on this site in the twelfth century, when the Anglo-Normans came to Ireland. Until the seventeenth century the land was managed by the O'Carroll family, and then the estate passed to the Parsons. In 1620 Sir Laurence Parsons received Birr Castle and the surrounding lands as a reward for his service (as of 09/2026, IrelandExplore). The new owner built the house you see today and laid out the first garden.

In the early nineteenth century his descendant, the second Earl of Rosse, rebuilt the facade in the Gothic style. That is how the estate got the turrets and battlements you know from photographs.

The astronomer earl and the blacksmith countess

Birr Castle with crenellated towers amid lawns and trees

The main figure in this story, the third Earl of Rosse William Parsons, was a politician, a peer of Ireland, and president of the Royal Society of London. Astronomy remained his passion, and for its sake he learned to make telescopes.

In the workshop he was helped by his wife Mary Rosse. She mastered blacksmithing, took up photography, and together with her husband carried out the estate's boldest project. You will read about this couple's work in the science center.

The Leviathan telescope

Restored Leviathan telescope with stairs and railing

The estate's main attraction stands at the far end of the park. The Leviathan telescope was built in 1845, and for the next 75 years it remained the largest telescope in the world (as of 09/2026, IrelandExplore).

The 183 cm mirror was cast from an alloy of copper and tin, and it weighed more than three tons. Polishing took about three years: finishing such a surface by hand was nearly impossible. The 18-meter tube was assembled from spruce and bound with iron rings (as of 09/2026, estate website).

For this project, the Earl opened workshops on the estate and trained local farmers to grind mirrors. Today you can walk all the way around the telescope and examine its supports.

It was through the Leviathan's eyepiece that the spiral shape of nebulae was first observed. The discovery earned the third Earl a place in the history of astronomy.

A 19th-century photography studio

Neo-Gothic St. Brendan's Church on a Birr street

Mary Rosse went down in history as Ireland's first female photographer. Her laboratory in the castle was packed with technical innovations, on which the couple spared no expense. After her death, no one entered the room until 1983, so it survived almost untouched (as of 09/2026, IrelandExplore).

Today the former studio houses a photography museum. You'll see nineteenth-century photographs, old chemicals, and descriptions of the printing methods Mary Rosse used.

Birr Castle gardens

Birr Castle framed by a heart-shaped bench back

Beyond the castle walls lies a 120-acre park (as of 09/2026, DoIreland). Neat flowerbeds and trimmed hedges gradually give way to wild woodland with waterfalls and the banks of two rivers.

The estate has about 10 km of paths, and a walk will take you at least two hours (as of 09/2026, estate website). A suspension bridge built around 1820 crosses the river; nowadays it is opened only occasionally.

You'll easily find the secluded bench with monograms. The tallest treehouse in Ireland, with a children's playground, also stands here.

Botanical garden

The estate's collection includes more than five thousand plant species from around the world (as of 09/2026, DoIreland). For decades, gardeners selected species that can withstand Ireland's damp climate.

The garden's pride is the davidia, also known as the handkerchief tree. The sapling was brought to Ireland in the middle of the last century, and it bloomed only after a long dormant period. In early June, large white flowers open on the tree, and it's worth coming here specifically for them.

The Earl of Rosse in person

The title of Earl of Rosse is hereditary, and today Brendan Parsons, the seventh Earl of the dynasty, lives in the castle. The house is closed to visitors: it is a working residence, not a museum (as of 09/2026, estate information).

Since the end of the last century, the family has been restoring their ancestors' legacy. The telescope has been restored, and the halls now house museums with the astronomer's manuscripts and his drawings of distant galaxies.

Tickets and opening hours

The estate is open every day: from 9:00 to 18:00 in summer, and from 9:00 to 16:00 in winter (as of 09/2026, DoIreland). The ticket is valid only for the date you select, and in stormy weather the park is sometimes closed without notice.

Ticket	Price	Source
Adult	14 €	DoIreland
Family, 2 adults and 2 children	35 €	DoIreland
Castle tour	22 €	Historic Houses of Ireland

The general ticket does not include access to the castle interior. From mid-May through August, the family runs tours of the living quarters: they must be booked in advance and are open to visitors aged 12 and over (as of 09/2026, estate website). Hours and prices were checked on the official website on 15.09.2026, but it is worth checking them again before your trip.

Tours and tickets

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Things to do

Allow at least half a day to explore the estate. In addition to the park and the telescope, you will find the Historic Science Centre of Ireland, an exhibition about the Parsons family, and the site of the tallest treehouse in the country.

Walk to St. Brendan's Well, which dates from the sixth century, and to the I-LOFAR station: a modern radio observatory operates next to the historic telescope. The science centre displays the instrument the fourth Earl used to measure the heat of the Moon.

For guided trips around Ireland, GetYourGuide tours are a good option.

How to get there on your own

Main street of Birr with a column in the distance

The castle is in County Offaly, in the town of Birr. From Dublin it takes about 1.5 hours by car via the M7 motorway and the N52 road, and from Tullamore it is about 40 minutes (as of 09/2026, IrelandExplore).

Without a car, the trip is more complicated. The nearest railway stations are in Tullamore and Portlaoise, and from both there is a bus or taxi to Birr (as of 09/2026, estate website). Local Link routes connect the town with Portlaoise, and Kearns Bus with Tullamore.

The easiest option is to rent a car: that way you can combine the castle with other places in Offaly. You can compare offers on DiscoverCars in advance.

⁉️🤔 Frequently asked questions

Can you go inside the castle?

The castle remains the private home of the Parsons family, so a general ticket only gives access to the park, the science center, and the grounds. The living quarters are shown from mid-May through August on a separate tour that must be booked in advance. Children under twelve are not allowed on these tours.

How much does a ticket to Birr Castle cost?

An adult ticket costs 14 €, and a family ticket for two adults and two children costs 35 € (as of 09/2026, DoIreland). Children under three enter free. The ticket is valid only for the selected date, so it is best not to mix up the date.

What should you see on the estate in one day?

First, head to the Leviathan telescope at the far end of the park. The path to it passes the formal gardens, the botanical collection, and the lake. On the way back, you can stop at the Historic Science Centre of Ireland and the Mary Rosse photography museum.

When is the best time to visit Birr?

Ireland's mild climate makes walking possible almost all year round, but rain is frequent here. In summer the estate closes at 6:00 PM, and in winter as early as 4:00 PM (as of 09/2026, seasonal hours). Check the exact hours on the official website before your trip.

How do you get there without a car?

First take a train or bus to Tullamore or Portlaoise, then a local bus to Birr. Local Link and Kearns Bus schedules are infrequent, so it is best to check times in advance. From Dublin the journey usually takes about two and a half hours.

In short: what is worth booking

Birr Castle is a rare case where an aristocratic residence remains alive and open to visitors. People come here for the park, the telescope, and a peaceful day away from the bustle of the city.

If you only have half a day, start with the science center and then walk to the Leviathan. If you are traveling with children, leave time for the playground with the treehouse. Without a car, plan your route via Tullamore in advance. A family ticket for four costs 35 € and pays for itself in a single visit (as of 09/2026, ticket prices). You can book a guided tour in advance: tours on GetYourGuide.

Birr castle: what to see at the estate with the Leviathan telescope