USDA hardiness zone lookup
Olathe, KS — USDA Zone 6a
Olathe, Kansas · 173-day growing season
Frost dates and growing season in Olathe
| USDA hardiness zone | Zone 6a |
|---|---|
| Average last spring frost | April 22 |
| Average first fall frost | October 12 |
| Growing season length | ~173 days |
| Temperature range (F) | -10 to 0°F |
| Temperature range (C) | -23 to -18°C |
All of Olathe's mapped ZIP codes fall in the same hardiness band, Zone 6a.
These are 50%-probability averages modeled from Olathe's USDA hardiness zone and regional climate normals — not a single-station reading. In a typical year the last spring frost will have passed by April 22, but a colder-than-average year can run 1-2 weeks later. Plant tender crops (tomatoes, peppers, basil) once both soil and night temperatures are consistently warm — a thermometer beats the calendar.
Growing season in Olathe
Olathe, Kansas sits in USDA Zone 6a, with roughly 173 frost-free days between an average last spring frost around April 22 and a first fall frost around October 12. That is a standard temperate season — most common vegetables finish comfortably, and a single main planting plus one succession round works well.
What grows in Olathe
Olathe falls in USDA Zone 6a, so the same hardiness constraints apply as the full Zone 6 guide. Vegetables, herbs, and fruit trees rated to Zone 6a (or hardier) will overwinter here in a typical year.
- Tomatoes (all types)
- Peppers, eggplant
- Squash, melons, cucumbers
- Beans, peas
- Sweet corn
- Apples, pears, peaches, plums
- Cherries, blueberries
- Asparagus, rhubarb
- Garlic (fall-planted)
- Strawberries
What to plant in Olathe this week
Olathe is in high summer — most spring plantings are in. Keep an eye on watering and start planning your fall crop. Cool-season seedlings (broccoli, cabbage, lettuce) can be started indoors for a fall transplant.
- When to plant tomatoes in zone 6
- When to plant peppers in zone 6
- When to plant bush beans in zone 6
- When to plant cucumbers in zone 6
- When to plant basil in zone 6
Full planting calendar for Olathe
Crop-by-crop sowing, transplant, and harvest dates calibrated to zone 6 averages:
- When to plant tomatoes in zone 6
- When to plant peppers in zone 6
- When to plant basil in zone 6
- When to plant garlic in zone 6
- When to plant lettuce in zone 6
- When to plant bush beans in zone 6
- When to plant cucumbers in zone 6
- When to plant summer squash in zone 6
- When to plant peas in zone 6
- When to plant carrots in zone 6
ZIP codes in Olathe
Drill down to the precise frost window and planting calendar for a specific ZIP in Olathe:
Local microclimate notes
Zone tables give you the average — but Olathegardens vary. South-facing walls and paved areas can run a full half-zone warmer than the published rating. Low-lying spots, frost pockets, and shaded north sides can run colder. If you've gardened here a few seasons, your own frost record — the last time you actually got frost damage — beats any national average.
Source and methodology
Hardiness zone from the USDA Plant Hardiness Zone Map (2023 revision). Frost-date and growing-season figures are modeled from Olathe's USDA hardiness zone and regional NOAA 1991-2020 climate normals — zone-level estimates, not a per-station record, so treat them as planning guidance and confirm against your own local frost history. Crop recommendations draw on US Cooperative Extension references, curated by the Growli editorial team. Last reviewed June 2026.
Other cities in Kansas
- Dodge City, KS — USDA Zone 6b
- Kansas City, KS — USDA Zone 6b
- Lawrence, KS — USDA Zone 6a
- Manhattan, KS — USDA Zone 6a
- Overland Park, KS — USDA Zone 6b
- Salina, KS — USDA Zone 6b
- Topeka, KS — USDA Zone 6a
- Wichita, KS — USDA Zone 7a
- All of Kansas by zone