Cucumber planting guide
Are Cucumbers Frost Tolerant? When to Plant Them
No. Cucumbers are not frost tolerant. Plant outdoors after your local last frost, once soil one inch below the surface reaches at least 70°F.
Quick answer
Are cucumbers frost tolerant?
No. Cucumbers are a warm-season crop and are not frost tolerant. Wait until the last frost has passed and the soil is at least 70°F at one inch deep before direct-sowing. Check your local frost estimate, then confirm the current forecast before planting.
Find your last frost date by ZIP Code →Frost tolerance
Not frost tolerant
Wait until after the last frost before planting outdoors.
Preferred method
Plant seeds outdoors
The university guide recommends sowing cucumbers where they will grow.
Soil temperature
At least 70°F
Measure one inch below the surface after the last frost date.
Seed depth
1/2 inch
Follow the variety packet if its instructions differ.
Soil pH
6.0–6.5
The reviewed guide recommends moisture-retentive, well-drained soil.
Outdoor planting check
Are both planting conditions met?
This check uses two conditions from a University of Minnesota garden guide. It does not know your location or current forecast.
Planting conditions
Cucumber frost tolerance, temperature and seed depth
Are cucumbers frost tolerant?
No. Cucumbers are a warm-season crop. Plant them outdoors after the last frost, and protect young plants if the forecast calls for an unexpected cold night.
What temperature do cucumbers need?
Wait until the soil is at least 70°F when measured one inch below the surface. Air temperature alone does not tell you whether the seed bed is warm enough.
How deep should cucumber seeds be planted?
Plant cucumber seeds 1/2 inch deep. Follow the variety packet when its instructions differ because seed size and growing method can vary.
Planting seeds outdoors
Wait for both frost and soil
The University of Minnesota guide recommends a soil thermometer. Plant after the last frost once soil one inch deep reaches at least 70°F. We do not reuse its Minnesota calendar dates nationwide because locations warm at different times.
Indoor backup
Do not start more than four weeks early
If you start seedlings indoors and move them outside later, begin no more than four weeks before the last frost. Use plantable pots to avoid damaging the main root during the move.
Why this page does not give one national planting date
The source gives Minnesota month examples, but this site does not present those dates as national guidance. Use your local frost estimate, measure your soil and check the current forecast.
Estimate my frost dates →Spacing and early care
Vining types
Sow seeds 2 inches apart, then thin emerged seedlings to 8–12 inches apart. Leave 2–3 feet on each side of the row for vines, or use a 3–4 foot trellis.
Hills and bush types
The source lists 5–6 feet between hills of vining cucumbers and 2–3 feet between rows or hills for short-vined bush types.
Row covers
Covers can protect young plants from cold nights, but remove them when flowering begins so pollinators can reach non-seedless varieties.
Water
The reviewed guide calls for about 1 inch of rain or irrigation per week during the growing season and recommends thoroughly soaking the soil while keeping leaves dry.
A practical next step
Plan cucumbers with your local season
Warm-season crops need more than a frost-free date. Check soil warmth and nighttime temperatures before planting outdoors.
- 1. Local dates
Find spring and fall frost dates
See historical 32°F freeze estimates and the matched NOAA station for your ZIP Code.
- 2. Season length
Estimate the frost-date growing window
Compare cautious, middle and less-cautious spring/fall date pairs.
- 3. Harvest timing
Estimate maturity from your seed packet
Use the starting point printed on your seed packet; days to maturity can count from sowing, emergence or transplanting.