Garden Guide

Garden Guide for Dublin, Eastern Ireland

Dublin enjoys a mild, humid oceanic climate in USDA Hardiness Zone 9b. Winters are mild and summers are cool, allowing for a long and productive growing season. The soil is often clayey and may require good drainage, but it's generally fertile and rich in nutrients.

In Dublin (Hardiness Zone 9b), you can garden almost year-round thanks to mild winters and cool summers. The last frost is typically at the end of February, and the first is in mid-December. You can sow lettuce from February to September, plant potatoes from March to May, and start tomatoes indoors from February to April.

Zone 9b Last frost: Late February First frost: Mid December Oceanic

Also applies to: Bray, Dún Laoghaire, Swords, Tallaght, Lucan, Malahide

Plan your Dublin garden in the Fryd app

Planting Calendar

When to start indoors, sow outdoors, and harvest in Dublin.

Light Water Nutrients

Start indoors Sowing Harvest

Planting calendar for Dublin, Zone 9b
Crop	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Tomato (Bush tomato) ●●● ●●○ ●●●
Tomato (Cocktail bush tomato) ●●● ●●○ ●●●
Pepper / Paprika ●●● ●●○ ●●●
Cucumber / Gherkin ●●● ●●○ ●●●
Courgette / Zucchini ●●● ●●● ●●●
Carrots ●●● ●●○ ●○○
Lettuce (Lettuce) ●●○ ●●○ ●●○
Strawberry ●●● ●●○ ●●●
Onion ●●● ●●○ ●●○
Garlic ●●● ●●○ ●○○
Bean (Dwarf bean) ●●● ●●○ ●○○
Bean (Runner bean) ●●● ●●○ ●○○
Basil ●●● ●●○ ●●●
Parsley ●●○ ●●○ ●●○
Chives ●●● ●●● ●●○
Dill ●●● ●●○
Potato ●●● ●●○ ●●●
Pea ●●● ●●○ ●○○
Chard ●●○ ●●○ ●●○
Spinach (Summer) ●○○ ●●● ●●○

Tomato (Bush tomato) ●●● ●●○ ●●●

Tomato (Cocktail bush tomato) ●●● ●●○ ●●●

Pepper / Paprika ●●● ●●○ ●●●

Cucumber / Gherkin ●●● ●●○ ●●●

Courgette / Zucchini ●●● ●●● ●●●

Carrots ●●● ●●○ ●○○

Lettuce (Lettuce) ●●○ ●●○ ●●○

Strawberry ●●● ●●○ ●●●

Onion ●●● ●●○ ●●○

Garlic ●●● ●●○ ●○○

Bean (Dwarf bean) ●●● ●●○ ●○○

Bean (Runner bean) ●●● ●●○ ●○○

Basil ●●● ●●○ ●●●

Parsley ●●○ ●●○ ●●○

Chives ●●● ●●● ●●○

Dill ●●● ●●○

Potato ●●● ●●○ ●●●

Pea ●●● ●●○ ●○○

Chard ●●○ ●●○ ●●○

Spinach (Summer) ●○○ ●●● ●●○

Planting Calendar Dublin

Tomato (Bush tomato): Start indoors Feb - Apr, Sowing Apr - Jun, Harvest Jun - Nov (Light: high, Water: medium, Nutrients: high)
Tomato (Cocktail bush tomato): Start indoors Feb - Apr, Sowing Apr - Jun, Harvest Jun - Nov (Light: high, Water: medium, Nutrients: high)
Pepper / Paprika: Start indoors Jan - Feb, Sowing Apr - Jun, Harvest Jun - Nov (Light: high, Water: medium, Nutrients: high)
Cucumber / Gherkin: Start indoors Mar - May, Sowing Apr - Jun, Harvest May - Nov (Light: high, Water: medium, Nutrients: high)
Courgette / Zucchini: Start indoors Mar - May, Sowing Apr - Jun, Harvest Jun - Nov (Light: high, Water: high, Nutrients: high)
Carrots: Sowing Feb - Jun, Harvest Jun - Dec (Light: high, Water: medium, Nutrients: low)
Lettuce (Lettuce): Start indoors Jan - Aug, Sowing Feb - Sep, Harvest Mar - Dec (Light: medium, Water: medium, Nutrients: medium)
Strawberry: Start indoors Jan - Apr, Sowing Mar - May, Harvest Apr - Nov (Light: high, Water: medium, Nutrients: high)
Onion: Start indoors Jan - Feb, Sowing Feb - Apr, Harvest Jun - Oct (Light: high, Water: medium, Nutrients: medium)
Garlic: Sowing Sep - Nov, Harvest Jun - Aug (Light: high, Water: medium, Nutrients: low)
Bean (Dwarf bean): Start indoors Mar - Apr, Sowing Apr - Jun, Harvest Jun - Nov (Light: high, Water: medium, Nutrients: low)
Bean (Runner bean): Start indoors Mar - Apr, Sowing Apr - Jun, Harvest Jun - Nov (Light: high, Water: medium, Nutrients: low)
Basil: Start indoors Feb - Jun, Sowing Apr - Jul, Harvest Apr - Nov (Light: high, Water: medium, Nutrients: high)
Parsley: Start indoors Jan - Jul, Sowing Feb - Jul, Harvest Mar - Dec (Light: medium, Water: medium, Nutrients: medium)
Chives: Start indoors Feb - May, Sowing Mar - May, Harvest Mar - Nov (Light: high, Water: high, Nutrients: medium)
Dill: Sowing Mar - Jul, Harvest May - Dec (Light: high, Nutrients: medium)
Potato: Start indoors Feb - Mar, Sowing Mar - May, Harvest May - Nov (Light: high, Water: medium, Nutrients: high)
Pea: Sowing Feb - Jun, Harvest Apr - Nov (Light: high, Water: medium, Nutrients: low)
Chard: Start indoors Jan - Apr, Sowing Mar - Jun, Harvest Apr - Dec (Light: medium, Water: medium, Nutrients: medium)
Spinach (Summer): Sowing Feb - May, Harvest Mar - Aug (Light: low, Water: high, Nutrients: medium)

Based on Fryd planting data for Zone 9b, 2026.

Companion Planting for Dublin

Plants that thrive together in Eastern Ireland.

Carrots + Tomato (Bush tomato)

Onion + Tomato (Bush tomato)

Carrots + Tomato (Cocktail bush tomato)

Onion + Tomato (Cocktail bush tomato)

Garlic + Pepper / Paprika

Plan companions visually

Drag and drop crops in the Fryd bed planner to see companion matches.

Try Fryd →

Growing Tips for Dublin

Give Your Plants a Head Start with Indoor Sowing

Many plants, like lettuce (January to August), Swiss chard (January to April), and tomatoes (February to April), really benefit from being started indoors. This protects young seedlings from cold and pests, and significantly extends your harvesting season!

Pay Attention to Your Soil

Aim for loose, humus-rich soil that drains well. Onions and garlic love sunny spots, while zucchini and cucumbers need nutrient-rich soil to really thrive.

Protect Frost-Sensitive Plants

Plants like zucchini, beans, cucumbers, basil, tomatoes, and peppers are sensitive to frost. Only sow or plant these outdoors after the last frost at the end of February, or start them safely indoors.

Consistent Watering is Key

Many crops, such as spinach (in summer), Swiss chard, and parsley, need consistent moisture, especially during germination and fruiting. Keep the soil moist, but avoid waterlogging to prevent root rot.

Common Pests & Diseases

•

Slugs

Keep your beds tidy and remove weeds that offer slugs shelter. You can also use iron phosphate-based slug pellets or set up beer traps to control their population.

•

Aphids

If you have an aphid infestation, you can spray the plants with a strong jet of water or a homemade soap solution. Encourage beneficial insects like ladybugs and lacewings, which love to munch on aphids.

•

Colorado Potato Beetles

Regularly hand-pick Colorado potato beetles and their larvae to prevent them from spreading. Good crop rotation and covering your plants with horticultural fleece can also help as a preventative measure.

•

Powdery Mildew

Ensure good air circulation between your plants and avoid overhead watering, especially in the evening. If an infestation occurs, sprays based on baking soda or horsetail tea can help curb its spread.

Frequently Asked Questions

When can I plant tomatoes in Dublin?

You should start tomatoes indoors from February to April and only transplant them outdoors after the last frost at the end of February. With good care, you can then harvest from June to November.

What hardiness zone is Dublin in?

Dublin is in Hardiness Zone 9b. This means you'll have mild winters and can successfully grow a wide variety of plants, often with a long harvesting period extending into late autumn.

What grows best in Dublin?

Many cold-hardy plants like lettuce, spinach, Swiss chard, carrots, and parsley thrive here. Potatoes and strawberries are also very well-suited to Dublin's climate and provide abundant harvests.

When is the last frost in Dublin?

The last frost in Dublin is typically at the end of February. After that, you can safely plant or sow frost-sensitive plants like beans, cucumbers, and zucchini outdoors without worrying about frost damage.