Growing Cucumber

Best Planting Times for Cucumbers in New Hampshire

Planting MethodActivityRecommended Dates
Outdoor PlantingIndoor Seed StartingMay 15 – June 1
Transplant OutdoorsJune 1 – June 15
Greenhouse PlantingYear-roundAdjust planting based on temperature control in the greenhouse

Planting Conditions

Cucumber Planting Conditions

New Hampshire’s climate can vary from coastal to continental, with USDA Hardiness Zones ranging from 3a to 6b. It’s essential to consider these factors for successful cucumber planting in the state.

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Useful Tools for Starting Cucumbers Indoors

Using the right tools can save you time and increase your success rate.

Seeds

Quality seeds lead to better germination and healthier plants. Starting with high-quality seeds gives your cucumbers the best chance to thrive from the very beginning.
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Planting Trays

Planting trays help you organize your seedlings and ensure they have enough space to grow before you transplant them outdoors. This makes the process more efficient and increases the chances of strong, healthy plants.
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Grow Lights

Grow lights are essential if you don’t have enough natural sunlight. They provide your seedlings with the light they need to grow strong and healthy, even in less-than-ideal conditions.
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Seed Starting Soil

Using light, fine soil specifically designed for seed starting helps young roots establish quickly and promotes healthy growth. It’s an easy way to give your seedlings the best start possible.
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Greenhouse Growing

In New Hampshire, where temperature fluctuations can impact cucumber growth, a greenhouse provides a stable environment for optimal development. Greenhouses extend the growing season, protect plants from extreme weather, and allow for year-round cultivation with proper climate control.

Consider investing in a 10×12 FT Greenhouse priced at $1,199 to ensure your cucumbers thrive in a controlled environment.
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Fertilizer

For optimal cucumber growth in New Hampshire, supplementing with fertilizer can ensure abundant and healthy harvests. Quality fertilizer helps replenish nutrients in the soil and promotes vigorous plant growth.
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Plant cucumbers outdoors in New Hampshire based on the recommended dates, ensuring the soil is warm enough for optimal growth.

Average Last Frost Dates for New Hampshire’s Major Cities

CityAverage Last Frost Date
ManchesterMay 15
NashuaMay 20
ConcordMay 10
DerryMay 25
DoverMay 12
RochesterMay 16
SalemMay 22
MerrimackMay 18
HudsonMay 14
LondonderryMay 19

Disclaimer: Frost dates are average estimates, and actual conditions may vary. It is recommended to monitor local forecasts and adapt planting decisions accordingly.

Starting Cucumbers Indoors

In cities like New Hampshire (Zone 5b), begin indoor cucumber seed starting between May 1 and June 1. This timeline ensures healthy seedlings ready for outdoor transplantation starting from mid-June to early July once the risk of frost has passed.

Transplanting Cucumber Seedlings

Transplant cucumber seedlings outdoors from June 15 to July 1, ensuring the soil has warmed above 60°F consistently. Space the seedlings 12-24 inches apart in rows with at least 36 inches between rows for optimal growth.

General Care and Maintenance

Watering

  • Provide consistent and deep watering to maintain evenly moist soil. New Hampshire’s climate necessitates regular watering to prevent soil dryness.
  • Water at the base of plants to avoid leaf wetness, reducing the risk of fungal diseases.

Fertilizing

  • Apply a balanced fertilizer during planting and when the first fruits start forming. Incorporating compost before planting can enhance soil fertility and structure.

Pest and Disease Management

  • Regularly monitor for common pests like aphids, cucumber beetles, and powdery mildew. While New Hampshire has varied humidity levels, pest vigilance is essential.
  • Implement organic or integrated pest management methods to protect cucumber plants from pests and diseases.

Harvesting

  • Harvest cucumbers when they reach the desired size and color. Regular harvesting promotes continuous fruiting and prevents over-mature fruits.
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