Frost dates for 71340Harrisonburg, LA
The average last spring frost in Harrisonburg is March 6 and the average first fall frost is November 22, giving a typical growing season of about 261 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 6
- Average first fall frost
- Nov 22
- Growing season
- 261 days
Safer after Mar 25 (1-in-10 risk)
Possible by Nov 3 (1-in-10 risk)
First frost typically in 21 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Feb 28 · Mar 19 · Apr 5 | Oct 27 · Nov 10 · Nov 29 | 236 days | 100% |
| Frost / freeze (32°F) | Feb 9 · Mar 6 · Mar 25 | Nov 3 · Nov 22 · Dec 11 | 261 days | 100% |
| Hard freeze (28°F) | Jan 16 · Feb 22 · Mar 16 | Nov 13 · Dec 5 · Jan 6 | 292 days | 99% |
Planting calendar for Harrisonburg
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Feb 3 – Apr 11 |
| Tomatoes | Transplant outdoors | Mar 22 – Aug 2 |
| Peppers | Start seeds indoors | Feb 3 – Mar 6 |
| Peppers | Transplant outdoors | Apr 5 – May 6 |
| Eggplant | Start seeds indoors | Feb 20 – Mar 21 |
| Eggplant | Transplant outdoors | Apr 5 – May 6 |
| Cucumbers | Sow outdoors | Apr 5 – Aug 12 |
| Summer squash | Sow outdoors | Mar 22 – May 6 |
| Winter squash & pumpkins | Sow outdoors | Apr 5 – May 6 |
| Snap beans | Sow outdoors | Mar 22 – Sep 4 |
| Sweet corn | Sow outdoors | Mar 22 – Aug 2 |
| Watermelon & cantaloupe | Sow outdoors | Apr 5 – May 6 |
| Okra | Sow outdoors | Mar 29 – Apr 21 |
| Peas | Sow outdoors (spring) | Feb 3 – Mar 21 |
| Potatoes | Plant outdoors (spring) | Feb 3 – Apr 5 |
| Onions | Start seeds indoors (spring) | Dec 23 – Jan 19 |
| Onions | Transplant outdoors (spring) | Feb 20 – Mar 21 |
| Broccoli | Start seeds indoors (spring) | Jan 16 – Feb 19 |
| Broccoli | Transplant outdoors (spring) | Feb 20 – Mar 21 |
| Broccoli | Start seeds indoors (fall) | Jul 23 – Aug 2 |
| Broccoli | Transplant outdoors (fall) | Aug 22 – Sep 2 |
| Cabbage | Start seeds indoors (spring) | Jan 6 – Feb 3 |
| Cabbage | Transplant outdoors (spring) | Feb 3 – Mar 6 |
| Cabbage | Start seeds indoors (fall) | Jul 13 – Aug 12 |
| Cabbage | Transplant outdoors (fall) | Aug 12 – Sep 12 |
| Leaf lettuce | Sow outdoors (spring) | Feb 3 – Apr 21 |
| Leaf lettuce | Sow outdoors (fall) | Aug 12 – Sep 28 |
| Spinach | Sow outdoors (spring) | Jan 27 – Mar 12 |
| Spinach | Sow outdoors (fall) | Aug 29 – Oct 3 |
| Radishes | Sow outdoors (spring) | Feb 3 – Mar 26 |
| Radishes | Sow outdoors (fall) | Aug 12 – Oct 13 |
| Kale | Sow outdoors (spring) | Feb 20 – Mar 12 |
| Kale | Sow outdoors (fall) | Aug 5 – Sep 12 |
| Carrots | Sow outdoors (spring) | Mar 6 – Apr 21 |
| Carrots | Sow outdoors (fall) | Jul 13 – Aug 28 |
| Garlic | Plant outdoors (fall) | Nov 12 – Dec 13 |
Where these dates come from
ZIP code 71340 is matched to the NOAA station Jonesville Locks, LA, 33.2 km away, at 70 ft elevation (37 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Jonesville Locks, LA (used) | 70 ft | Mar 6 | Nov 22 |
| Jena, LA | 143 ft | Mar 19 | Nov 12 |
| Winnsboro 5 Sse, LA | 80 ft | Mar 10 | Nov 16 |
| Winnsboro 2 Se, LA | 74 ft | Mar 7 | Nov 13 |
Frost dates near Harrisonburg
- Jonesville, LA 71343 · last Mar 6, first Nov 22
- Sicily Island, LA 71368 · last Mar 10, first Nov 16
- Enterprise, LA 71425 · last Mar 10, first Nov 16
- Aimwell, LA 71401 · last Mar 19, first Nov 12
- Wildsville, LA 71377 · last Mar 6, first Nov 22
- Rhinehart, LA 71363 · last Mar 19, first Nov 12
- Wisner, LA 71378 · last Mar 10, first Nov 16
- Ferriday, LA 71334 · last Mar 16, first Nov 9
Frequently asked questions
- When is the last frost in Harrisonburg, LA?
- For ZIP code 71340, the average last spring frost (32°F) is March 6, based on NOAA 1991-2020 climate normals for the Jonesville Locks, LA weather station. There is a 1-in-10 chance of a frost after March 25.
- When is the first frost in Harrisonburg, LA?
- The average first fall frost (32°F) is November 22. There is a 1-in-10 chance of frost by November 3, so tender plants are at risk from that point on.
- How long is the growing season in 71340?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 261 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.