In zone 9, plant cantaloupe (muskmelon) and other melons outside around March 17, two weeks after your last spring frost, once the soil is warm. For transplants, start seeds indoors from February 17 to February 24. Expect ripe melons from about May 26.
Melon dates for your ZIP code
Planting times based on university extension guidance (UNH, Cornell, Purdue, Minnesota, Nebraska and UMass Extension). Frost dates from NOAA 1991–2020 U.S. Climate Normals, nearest weather station. Zones derived from the 2023 USDA Plant Hardiness Zone Map data (PRISM Climate Group, Oregon State University). This is not the official USDA Plant Hardiness Zone Map.
Melon timing in zone 9
| Task | When |
|---|---|
| Start indoors | February 17 – February 24 |
| Transplant outside | March 17 |
| First harvest | May 26 – June 5 |
| Plant early | Soon after the soil warms, to beat peak pests |
| Cut back water | Once the fruit starts to ripen |
| Harvest cantaloupe | At full slip, when the stem separates easily |
Most of zone 9 sees its last spring frost between February 16 and March 15 (typical March 3) and its first fall frost between November 15 and December 5 (typical November 25). Melons need warm soil and warm weather, and frost kills them. The tool above uses the weather station closest to your ZIP code.
Why melons wait for warm weather
Melons are warm-season crops. Frost kills them, and cool soil and weather stall their growth. They go out about two weeks after the last spring frost, once the soil is warm. Starting transplants indoors gives you a head start of up to four weeks.
Best melon varieties for zone 9
Zone 9 has the long, warm season melons love:
- Cantaloupe (muskmelon), the classic netted melon.
- Honeydew and specialty melons, which thrive in long, hot summers.
- Disease-resistant varieties, helpful where mildew is common in humid weather.
How to plant melons
- Start seeds indoors about three to four weeks before transplanting, in individual pots.
- Lay black plastic or landscape fabric for larger, earlier harvests.
- Space plants about 2 feet apart in rows 5–6 feet apart, or 2–3 plants per hill.
- Water well during establishment and fruit growth.
- Cut back watering once the fruit begins to ripen.
Zone 9 melon tips
- Plant as soon as the soil warms so melons ripen before pests and diseases peak.
- Space plants about 2 feet apart in rows 5–6 feet apart.
- Water deeply while fruit grows, then cut back as it ripens.
- Protect pollinators by avoiding pesticides during bloom.
Harvesting melons
Pick cantaloupe at full slip, when the melon separates from the stem with a gentle push. Most melons ripen 80–100 days after transplanting, and each plant gives about 2–4 fruits.
Melon planting dates in nearby zones
- Zone 8April 14
See dates for every zone on the melons planting guide, or build a full schedule with the planting calendar.
Frequently asked questions
Is it too late to plant melons in zone 9 in April?
Usually not. Your season is long enough for a April planting to ripen before your first frost around November 25.
How do I know a cantaloupe is ripe?
It separates from the vine with a gentle push, called full slip.
Can I plant melons before the last frost?
No. Melons are killed by frost and need warm soil. Plant about two weeks after your last frost.
What is the difference between cantaloupe and muskmelon?
In the US, the netted, orange-fleshed melons sold as cantaloupe are muskmelons. True cantaloupes, such as Charentais, are smooth-skinned European melons.
Why are my melons not sweet?
Overwatering as they ripen dilutes the flavor. Cut back water once the fruit starts to ripen, and harvest at full slip.
Sources. Planting dates use the median frost dates of each USDA zone, calculated from NOAA climate data for every ZIP code in the zone.