Garden Guide

Garden Guide for Oslo, Eastern Norway

Oslo is in Hardiness Zone 6b and enjoys a temperate climate with relatively mild winters and cool summers, influenced by its proximity to the Oslofjord. The soil is often loamy and nutrient-rich, but can also have sandier or stonier areas. Good soil preparation with compost is especially important here to improve its structure and fertility.

In Oslo, Hardiness Zone 6b, you can start gardening after the last frost in mid-April and before the first frost at the end of October. Cold-hardy plants like lettuce can be started indoors from March to October and harvested from May to October. Radishes can be sown from April to September for a harvest from June to October, while potatoes can be chitted from March and harvested from June to October. Tomatoes are best started indoors from April to May for harvesting from August to October.

Zone 6b Last frost: Mid April First frost: Late October temperate

Also applies to: Drammen, Lillestrøm, Jessheim, Ski, Asker, Bærum

Plan your Oslo garden in the Fryd app

Planting Calendar

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

Light Water Nutrients

Start indoors Sowing Harvest

Planting calendar for Oslo, Zone 6b
Crop	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Carrots ●●● ●●○ ●○○
Lettuce (Lettuce) ●●○ ●●○ ●●○
Cucumber / Gherkin ●●● ●●○ ●●●
Courgette / Zucchini ●●● ●●● ●●●
Pepper / Paprika ●●● ●●○ ●●●
Potato ●●● ●●○ ●●●
Radishes ●●● ●●○ ●○○
Tomato (Bush tomato) ●●● ●●○ ●●●
Tomato (Cocktail bush tomato) ●●● ●●○ ●●●
Onion ●●● ●●○ ●●○
Bean (Dwarf bean) ●●● ●●○ ●○○
Pea ●●● ●●○ ●○○
Basil ●●● ●●○ ●●●
Beetroot ●●● ●●○ ●●○
Strawberry ●●● ●●○ ●●●
Kohlrabi / German turnip / Turnip cabbage ●●● ●●○ ●●○
Garlic ●●● ●●○ ●○○
Pumpkin / Squash ●●● ●●● ●●●
Broccoli ●●● ●●● ●●●
Common marigold ●●● ●○○

Carrots ●●● ●●○ ●○○

Lettuce (Lettuce) ●●○ ●●○ ●●○

Cucumber / Gherkin ●●● ●●○ ●●●

Courgette / Zucchini ●●● ●●● ●●●

Pepper / Paprika ●●● ●●○ ●●●

Potato ●●● ●●○ ●●●

Radishes ●●● ●●○ ●○○

Tomato (Bush tomato) ●●● ●●○ ●●●

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

Onion ●●● ●●○ ●●○

Bean (Dwarf bean) ●●● ●●○ ●○○

Pea ●●● ●●○ ●○○

Basil ●●● ●●○ ●●●

Beetroot ●●● ●●○ ●●○

Strawberry ●●● ●●○ ●●●

Kohlrabi / German turnip / Turnip cabbage ●●● ●●○ ●●○

Garlic ●●● ●●○ ●○○

Pumpkin / Squash ●●● ●●● ●●●

Broccoli ●●● ●●● ●●●

Common marigold ●●● ●○○

Planting Calendar Oslo

Carrots: Sowing Apr - Jun, Harvest Aug - Oct (Light: high, Water: medium, Nutrients: low)
Lettuce (Lettuce): Start indoors Mar - Oct, Sowing Apr - Sep, Harvest May - Oct (Light: medium, Water: medium, Nutrients: medium)
Cucumber / Gherkin: Start indoors May - Jul, Sowing Jun - Jul, Harvest Jul - Sep (Light: high, Water: medium, Nutrients: high)
Courgette / Zucchini: Start indoors May - Jul, Sowing Jun - Jul, Harvest Aug - Oct (Light: high, Water: high, Nutrients: high)
Pepper / Paprika: Start indoors Feb - Mar, Sowing May - Jun, Harvest Jul - Oct (Light: high, Water: medium, Nutrients: high)
Potato: Start indoors Mar, Sowing Mar - Jun, Harvest Jun - Oct (Light: high, Water: medium, Nutrients: high)
Radishes: Sowing Apr - Sep, Harvest Jun - Oct (Light: high, Water: medium, Nutrients: low)
Tomato (Bush tomato): Start indoors Apr - May, Sowing Jun - Jul, Harvest Aug - Oct (Light: high, Water: medium, Nutrients: high)
Tomato (Cocktail bush tomato): Start indoors Apr - May, Sowing Jun - Jul, Harvest Aug - Oct (Light: high, Water: medium, Nutrients: high)
Onion: Start indoors Feb - Apr, Sowing Apr - May, Harvest Aug - Sep (Light: high, Water: medium, Nutrients: medium)
Bean (Dwarf bean): Start indoors May - Jun, Sowing Jun - Aug, Harvest Aug - Sep (Light: high, Water: medium, Nutrients: low)
Pea: Sowing Apr - Jul, Harvest Jun - Oct (Light: high, Water: medium, Nutrients: low)
Basil: Start indoors Apr - Aug, Sowing Jun - Aug, Harvest Jun - Oct (Light: high, Water: medium, Nutrients: high)
Beetroot: Start indoors Mar - Apr, Sowing Apr - Jul, Harvest Jul - Oct (Light: high, Water: medium, Nutrients: medium)
Strawberry: Start indoors Mar - Jun, Sowing Apr - Jul, Harvest Jun - Sep (Light: high, Water: medium, Nutrients: high)
Kohlrabi / German turnip / Turnip cabbage: Start indoors Apr - Jun, Sowing May - Jul, Harvest Jul - Oct (Light: high, Water: medium, Nutrients: medium)
Garlic: Sowing Sep - Nov, Harvest Jun - Aug (Light: high, Water: medium, Nutrients: low)
Pumpkin / Squash: Start indoors May - Jul, Sowing Jun - Jul, Harvest Sep - Oct (Light: high, Water: high, Nutrients: high)
Broccoli: Start indoors Mar - May, Sowing Jun - Jul, Harvest Aug - Oct (Light: high, Water: high, Nutrients: high)
Common marigold: Start indoors Apr - May, Sowing May - Aug, Harvest Jul - Oct (Light: high, Nutrients: low)

Based on Fryd planting data for Zone 6b, 2026.

Companion Planting for Oslo

Plants that thrive together in Eastern Norway.

Lettuce (Lettuce) + Carrots

Radishes + Carrots

Lettuce (Lettuce) + Radishes

Onion + Cucumber / Gherkin

Garlic + Cucumber / Gherkin

Plan companions visually

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

Try Fryd →

Growing Tips for Oslo

Give Warm-Season Crops a Head Start

For frost-sensitive plants like tomatoes (start indoors April to May), peppers (start indoors February to March), and squash (start indoors May to July), starting them indoors is crucial. This protects young plants from cool spring temperatures and ensures a strong start before they can be moved outdoors after mid-April.

Soil Care for Abundant Harvests

Ensure loose, humus-rich, and well-draining soil, especially for radishes and carrots, which can become woody if the soil is too dry. Regularly adding compost improves soil structure and nutrient supply, which is important for many crops like broccoli and potatoes.

Ensure Consistent Moisture

Many vegetables, including radishes, broccoli, and squash, need a consistent water supply to thrive. If dry, radishes can become woody, and broccoli and squash will suffer from stress. Always keep the soil moist, but avoid waterlogging.

Protect Frost-Sensitive Plants

Since the last frost in Oslo is typically mid-April and the first frost is at the end of October, you should only plant frost-sensitive plants like beans (sow June to August), cucumbers, or courgette outdoors from mid-May. In case of unexpected cold snaps, a fleece cover or other protection is advisable to safeguard your harvest.

Common Pests & Diseases

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Keep Snails and Slugs in Check

Snails and slugs can become a problem, especially during damp periods. Regularly hand-pick them, set up slug traps, or use iron phosphate-based slug pellets. A barrier of sawdust or eggshells can also help protect your plants.

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Naturally Combat Aphids

If you have an aphid infestation, you can spray the plants with a strong stream of water or use a soapy water solution. Encourage beneficial insects like ladybirds and lacewings in your garden, as they are natural predators of aphids.

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Prevent Fungal Diseases

Ensure adequate plant spacing and good air circulation to prevent fungal diseases like powdery mildew. Always water plants at the base and avoid wetting the leaves, especially in the evening. Plant strengtheners like horsetail tea can make plants more resilient.

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Crop Rotation for Healthy Soil

Practice crop rotation by not planting the same crops in the same spot every year. This prevents the spread of soil-borne diseases and pests and maintains long-term soil health and fertility.

Frequently Asked Questions

When should you plant tomatoes in Oslo?

Tomatoes are frost-sensitive and should only be planted outdoors in Oslo after mid-April. It's best to start them indoors from April to May to get strong young plants that you can then transplant outdoors from June. Harvesting then takes place from August to October.

What Hardiness Zone is Oslo in?

Oslo is in Hardiness Zone 6b. This means you can expect average annual minimum temperatures between -20.5 °C and -17.8 °C. This zone allows for growing a wide variety of vegetables and herbs.

Which vegetables grow well in Oslo?

Many cold-hardy vegetables thrive in Oslo. These include lettuce, radishes, carrots, onions, garlic, potatoes, kohlrabi, broccoli, peas, and beetroot. Strawberries are also a great choice for your garden.

When is the last frost in Oslo?

The last frost in Oslo is typically mid-April. It's advisable to only plant frost-sensitive plants like beans, cucumbers, or tomatoes outdoors after this date to avoid damage.