In zone 5, plant basil outside around May 22, about two weeks after your last spring frost, once the soil is at least 60 °F. Start seeds indoors from March 27 to April 10. Basil is sensitive to cold, so don’t rush it.
Basil 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.
Basil timing in zone 5
| Task | When |
|---|---|
| Start indoors | March 27 – April 10 |
| Transplant outside | May 22 |
| First harvest | May 26 – June 19 |
| Pinch tips and flower buds | All season, as soon as buds form |
| Bring pots indoors or harvest all | When nights drop toward 50 °F, before your first frost around October 2 |
Most of zone 5 sees its last spring frost between May 2 and May 17 (typical May 8) and its first fall frost between September 28 and October 7 (typical October 2). Basil is damaged at temperatures around 50 °F, well above freezing, so it waits until nights are warm. The tool above uses the weather station closest to your ZIP code.
Why basil waits for warm weather
Basil is a tender annual herb that is sensitive to cold. Cold soil and air stunt its growth, and temperatures around 50 °F, well above freezing, can blacken its leaves. That is why it goes outside after the frost-free date, once the soil reaches at least 60 °F.
Best basil varieties for zone 5
Any basil grows in zone 5 once summer warms up. Popular types:
- Genovese basil: the classic large-leaved sweet basil for pesto.
- Thai basil: licorice-like aroma, great in Asian dishes.
- Lemon basil: intense lemon fragrance.
- Purple basil such as Dark Opal, Emerald Wine and Rubin.
How to plant basil
- Start seeds indoors in a warm spot: they need at least 70 °F and sprout in 5–7 days.
- Grow seedlings in full sun or under lights.
- Transplant after your frost-free date, once the soil is 60 °F or warmer.
- Pinch the stem tips once plants have a few sets of leaves, to make them bushy.
- Sow again every two weeks for a continuous supply.
Zone 5 basil tips
- Wait for warmth. Cold soil and air stunt basil, and temperatures near 50 °F blacken its leaves.
- Grow some in pots. Containers warm up quickly and can come indoors on cold nights.
- Pinch often. Pinching the stem tips makes bushier plants, and removing flower buds keeps the leaves coming.
- Harvest everything before cold nights in late summer, and dry or freeze what you can’t use.
Harvesting basil
Harvest lightly from young plants, then pick individual leaves and stem tips as the plants grow. Regular picking keeps basil bushy and productive. Remove flower buds as soon as they appear. Basil can be harvested about 60–70 days after sowing, and it dries easily for winter use. Avoid refrigerating fresh basil, which darkens the leaves.
Basil planting dates in nearby zones
See dates for every zone on the basil planting guide, or build a full schedule with the planting calendar.
Frequently asked questions
Is it too late to plant basil in zone 5 in June?
No. Basil grows fast in warm weather. Plants set out in June still give you weeks of harvests before nights turn cold.
Can basil survive a zone 5 fall outdoors?
Not for long. Basil is damaged around 50 °F, so harvest it or bring pots indoors before the first cold nights.
Can I plant basil before the last frost?
No. Basil is damaged by cold even above freezing. Plant it out after your frost-free date, once the soil is 60 °F.
Should I remove basil flowers?
Yes. Pinch off flower buds as soon as they form so the plant keeps producing leaves.
How do I store fresh basil?
Not in the refrigerator, which turns the leaves dark. Keep stems in water at room temperature for a few days, or dry the leaves.
Sources. Planting dates use the median frost dates of each USDA zone, calculated from NOAA climate data for every ZIP code in the zone.