When to plant melon (cantaloupe/watermelon) in Columbia
Melon (cantaloupe/watermelon) is frost-tender, so every date keys off Columbia's last spring frost of Mar 11.
Step 1 · Sow
Start seeds indoors
Mar 10 – Mar 31
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 6 – May 27
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 20 – Aug 14
Picking runs until conditions turn against the crop.
Window
Days to maturity
75 – 100 d
Columbia's 248-day season leaves this much room.
Melon (cantaloupe/watermelon) on Columbia's growing year
Frost-bounded season with crops mapped onto the 12-month axis.
Frost risk Growing Harvest
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
FROST
FROST
MAR 11
NOV 17
Common questions
When can I sow melon (cantaloupe/watermelon) outdoors in Columbia?
Direct-sow around early May (May 6–May 27) in Columbia, based on its local frost dates. Confidence 85%.
When will melon (cantaloupe/watermelon) be ready to harvest in Columbia?
Expect to harvest from around mid July (Jul 20–Aug 14) in Columbia, based on its local frost dates. Confidence 79%.
When should I start melon (cantaloupe/watermelon) seeds indoors in Columbia?
Start seeds indoors around early March (Mar 10–Mar 31) in Columbia, based on its local frost dates. Confidence 84%.
When can I transplant melon (cantaloupe/watermelon) outdoors in Columbia?
Transplant outdoors around early May (May 6–May 27) in Columbia, based on its local frost dates. Confidence 85%.
How long is the growing season in Columbia?
Columbia has roughly 248 frost-free days, which is enough time to grow melon (cantaloupe/watermelon) to maturity outdoors.
The rule of thumb
Sow melon (cantaloupe/watermelon) 6–8 weeks before your last spring frost; plant out 2–3 weeks after it. Every date on this page is derived from that rule and Columbia's frost dates.
Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.