Brownsburg, IN planting zone & frost dates
Brownsburg is in USDA hardiness zone 6a. The last spring frost usually comes around April 12 and the first fall frost around October 29, for a growing season of about 198 days.
Planting calendar for Brownsburg
Dates are counted from the average last spring frost (April 12) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Feb 15 – Mar 1 Transplant outdoors: Apr 19 – Apr 26 |
| Peppers | Start seeds indoors: Feb 1 – Feb 15 Transplant outdoors: Apr 26 – May 3 |
| Eggplant | Start seeds indoors: Feb 1 – Feb 15 Transplant outdoors: Apr 26 – May 3 |
| Broccoli | Start seeds indoors: Feb 1 – Feb 15 Transplant outdoors: Mar 15 – Mar 29 |
| Cabbage | Start seeds indoors: Feb 1 – Feb 15 Transplant outdoors: Mar 15 – Mar 29 |
| Onions (sets) | Plant outdoors: Mar 15 – Mar 29 |
| Peas | Sow outdoors: Mar 1 – Mar 15 |
| Spinach | Sow outdoors: Mar 1 – Mar 15 |
| Lettuce | Sow outdoors: Mar 15 – Mar 29 |
| Carrots | Sow outdoors: Mar 15 – Mar 29 |
| Potatoes | Plant outdoors: Mar 15 – Mar 29 |
| Beans | Sow outdoors: Apr 19 – Apr 26 |
| Sweet corn | Sow outdoors: Apr 19 – Apr 26 |
| Cucumbers | Sow outdoors: Apr 19 – Apr 26 |
| Squash & zucchini | Sow outdoors: Apr 19 – Apr 26 |
| Basil | Start seeds indoors: Mar 1 – Mar 15 Transplant outdoors: Apr 19 – Apr 26 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 3 (8 weeks before the average first fall frost on Oct 29).
Useful for zone 6a gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
- Cold frame / mini greenhouse — adds weeks to a short season
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Mar 30 | Apr 12 | Apr 29 |
| First 32°F frost in fall is before | Nov 10 | Oct 29 | Oct 16 |
How to read it: in spring there is a 10% chance of a frost after April 29, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 16. A hard freeze (28°F) usually ends around April 1.
Hardiness zone by ZIP code in Brownsburg
- 46112 zone 6a
Nearby cities
- Fairfield Heights zone 6a, last frost Apr 12
- Avon zone 6a, last frost Apr 12
- Speedway zone 6b, last frost Apr 12
- Plainfield zone 6a, last frost Apr 12
- Zionsville zone 6a, last frost Apr 21
- Lebanon zone 6a, last frost Apr 21
- Indianapolis zone 6b, last frost Apr 20
- Broad Ripple zone 6b, last frost Apr 18
Questions
What growing zone is Brownsburg, IN?
Brownsburg is in USDA Plant Hardiness Zone 6a (average extreme winter low -10°F to -5°F), according to the USDA 2023 map.
When is the last frost in Brownsburg?
The average last spring frost (32°F) in Brownsburg is April 12. There is still a 10% chance of frost until April 29.
When can I plant tomatoes in Brownsburg?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 19 – Apr 26. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Indianapolis Eagle Creek Ap, IN (USW00053842), 8.9 km (5.5 mi) from the city center, elevation 251 m, based on 24 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.